发表于

Animation Resources
View Animation : Tween animation

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<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@[package:]anim/interpolator_resource"
    android:shareInterpolator=["true" | "false"] >
    <alpha
        android:fromAlpha="float" where 0.0 is transparent and 1.0 is opaque.
        android:toAlpha="float" />
    <scale
        android:fromXScale="float"
        android:toXScale="float"
        android:fromYScale="float"
        android:toYScale="float"
        android:pivotX="float"
        android:pivotY="float" />
    <translate
        android:fromXDelta="float"
        android:toXDelta="float"
        android:fromYDelta="float"
        android:toYDelta="float" />
    <rotate
        android:fromDegrees="float"
        android:toDegrees="float"
        android:pivotX="float"
        android:pivotY="float" />
    <set>
        ...
    </set>
</set>

fade out after fade in
动画，执行顺序，并行，串行 sequentially simultaneously

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Animation fadeIn = new AlphaAnimation(0, 1);
fadeIn.setInterpolator(new DecelerateInterpolator()); //add this
fadeIn.setDuration(1000);

Animation fadeOut = new AlphaAnimation(1, 0);
fadeOut.setInterpolator(new AccelerateInterpolator()); //and this
fadeOut.setStartOffset(1000);
fadeOut.setDuration(1000);

AnimationSet animation = new AnimationSet(false); //change to false
animation.addAnimation(fadeIn);
animation.addAnimation(fadeOut);
this.setAnimation(animation);

例子

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anim/splash_tip.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <alpha
        android:duration="500"
        android:fromAlpha="0.0" android:toAlpha="1.0" />
    <alpha
        android:duration="500"
        android:fromAlpha="1.0" android:toAlpha="0.0"
        android:startOffset="500" />
</set>

filterEffectTipTv 配置里设置为隐藏的

dataBinding.filterEffectTipTv.startAnimation(
        AnimationUtils.loadAnimation(this, R.anim.splash_tip));

发表于 | 分类于 ， ， 
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Exception locking surface
    java.lang.IllegalArgumentException: Surface was already locked
        at android.view.Surface.lockCanvas(Surface.java:273)
        at android.view.SurfaceView$4.internalLockCanvas(SurfaceView.java:977)
        at android.view.SurfaceView$4.lockCanvas(SurfaceView.java:945)
        at com.caiyi.youle.camera.ui.VideoProgressView.myDraw(VideoProgressView.java:232)
        at com.caiyi.youle.camera.ui.VideoProgressView.run(VideoProgressView.java:119)
        at java.lang.Thread.run(Thread.java:818)

VideoProgressView.java

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public class VideoProgressView extends SurfaceView implements SurfaceHolder.Callback, Runnable {

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        thread = new Thread(this);
        drawing = true;
        thread.start();
    }

    @Override
    public void run() {
        while (drawing) {
            try {
                myDraw();
                Thread.sleep(80);  //这里40毫秒更新一次.
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

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private void myDraw() {
    canvas = holder.lockCanvas();

    progressHeight = getMeasuredHeight();

    if (canvas != null) {
        canvas.drawRect(0, 0, screenWidth, progressHeight, backgroundPaint);
    }

    countWidth = 0;

    if (!timeList.isEmpty()) {
        long curSegmentTime = 0;

        Iterator<Integer> iterator = timeList.iterator();
        while (iterator.hasNext()) {

            curSegmentTime = iterator.next(); //当前这一段的时间.

            float left = countWidth;
            countWidth += curSegmentTime * perWidth;
            if (canvas != null) {
                canvas.drawRect(left, 0, countWidth, progressHeight, progressPaint);
                canvas.drawRect(countWidth, 0, countWidth + breakWidth, progressHeight, breakPaint);
            }
            countWidth += breakWidth;
        }
    }

    if (timeList.isEmpty() || (!timeList.isEmpty() && timeList.getLast() <= minRecordTimeMS)) {
        float left = perWidth * minRecordTimeMS;
        if (canvas != null) {
            canvas.drawRect(left, 0, left + minTimeWidth, progressHeight, minTimePaint);
        }
    }
    if (currentState == State.BACKSPACE) {
        float left = countWidth - timeList.getLast() * perWidth;  //应该减去最后一段的时间.
        float right = countWidth;
        if (canvas != null) {
            canvas.drawRect(left, 0, right, progressHeight, rollbackPaint);
        }
    }
    /**
     *  手指按下时，绘制新进度条
     *
     *  绘制一个新的刻度.
     *
     *  当设置新的时间过来后, 这里应该是两个时间戳的相减
     */
    if (currentState == State.START) {
        perProgress += perWidth * (curProgressTimeMs - lastProgressTimeMs);

        float right = (countWidth + perProgress) >= screenWidth ? screenWidth : (countWidth + perProgress);

        if (canvas != null) {
            canvas.drawRect(countWidth, 0, right, progressHeight, progressPaint);
        }
    }

    long curSystemTime = System.currentTimeMillis();
    if (drawFlashTime == 0 || curSystemTime - drawFlashTime >= 500) {
        isVisible = !isVisible;
        drawFlashTime = curSystemTime;
    }

    if (isVisible) {
        if (currentState == State.START) {
            if (canvas != null) {
                canvas.drawRect(countWidth + perProgress, 0, countWidth + flashWidth + perProgress, progressHeight,
                        flashPaint);
            }
        } else {
            if (canvas != null) {
                canvas.drawRect(countWidth, 0, countWidth + flashWidth, progressHeight, flashPaint);
            }
        }
    }

    lastProgressTimeMs = curProgressTimeMs;
    if (canvas != null) {
        holder.unlockCanvasAndPost(canvas);
    }
}

发表于 
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GreatWall@GreatWall-PC MINGW64 /d/work/videoshare_android.git (master)
$ git pull --rebase
remote: Counting objects: 21, done.
remote: Compressing objects: 100% (19/19), done.
remote: Total 21 (delta 11), reused 0 (delta 0)
Unpacking objects: 100% (21/21), done.
From git.oschina.net:huangshan309/videoshare_anroid
   7a5bcb8..8f12aaa  master     -> origin/master
First, rewinding head to replay your work on top of it...
/mingw64/libexec/git-core/git-rebase--am: line 54: /mingw64/libexec/git-core/git: Invalid argument

git encountered an error while preparing the patches to replay
these revisions:

    8f12aaa608b02f16d5e07e3cc3faa1f8a23cb4d7...0406eb59af12c590b85f70ac6883e340466bbf61

As a result, git cannot rebase them.

GreatWall@GreatWall-PC MINGW64 /d/work/videoshare_android.git ((0406eb5...))
$ git status
Not currently on any branch.
nothing to commit, working tree clean

处理方法：
git checkout master
git pull –rebase

发表于 | 分类于 ， ， ， ，

MediaStore.Video
static final Cursor query(ContentResolver cr, Uri uri, String[] projection)

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private void fetchVideoList() {
    String[] columns = {
        MediaStore.Video.VideoColumns._ID,
        MediaStore.Video.VideoColumns.TITLE,
        MediaStore.Video.VideoColumns.ARTIST
    };
    Cursor list = MediaStore.Video.query(getContentResolver(),
            MediaStore.Video.Media.EXTERNAL_CONTENT_URI, columns);
    Log.i(TAG, "count: " + list.getCount());
}

比较：
ContentResolver public final @Nullable Cursor query(@RequiresPermission.Read @NonNull Uri uri,
@Nullable String[] projection, @Nullable String selection,
@Nullable String[] selectionArgs, @Nullable String sortOrder)

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class	MediaStore.Video.Media
class	MediaStore.Video.Thumbnails
参考：http://blog.csdn.net/chenjie19891104/article/details/6338910
    String[] thumbColumns = new String[]{
                MediaStore.Video.Thumbnails.DATA,
                MediaStore.Video.Thumbnails.VIDEO_ID
        };

        String[] mediaColumns = new String[]{
                MediaStore.Video.Media.DATA,
                MediaStore.Video.Media._ID,
                MediaStore.Video.Media.TITLE,
                MediaStore.Video.Media.MIME_TYPE
        };
        https://stackoverflow.com/questions/20517687/mediastore-video-thumbnails-getthumbnail?lq=1
        MediaStore.Video.Thumbnails
        public static Bitmap getThumbnail (ContentResolver cr, long origId, long groupId, int kind, BitmapFactory.Options options)
        http://www.jianshu.com/p/498c9d06c193
        Android读取本地照片和视频相册

异常情况

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#################################################################
Error Code : 1 (SQLITE_ERROR)
Caused By : SQL(query) error or missing database.
(no such column: _display_name (code 1): , while compiling: SELECT _id, _data FROM videothumbnails ORDER BY _display_name)
#################################################################)
#################################################################
  at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:181)
  at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:137)
  at android.content.ContentProviderProxy.query(ContentProviderNative.java:421)
  at android.content.ContentResolver.query(ContentResolver.java:489)
  at android.content.ContentResolver.query(ContentResolver.java:433)
  at android.provider.MediaStore$Video.query(MediaStore.java:1965)
  at work.wangxiang.lansodemo.LansoDemoActivity.fetchVideoList(LansoDemoActivity.java:148)
  at work.wangxiang.lansodemo.LansoDemoActivity.onTest(LansoDemoActivity.java:106)

        Cursor list = MediaStore.Video.query(getContentResolver(),
                MediaStore.Video.Thumbnails.EXTERNAL_CONTENT_URI, thumbColumns);

ref

Android - MediaStore.Video.query() is returning null
开源例子

发表于 | 分类于 ， ， ，

activity lifecycle
Activity Lifecycle

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public class Activity extends ApplicationContext {
    protected void onCreate(Bundle savedInstanceState);

    protected void onStart();

    protected void onRestart();

    protected void onResume();

    protected void onPause();

    protected void onStop();

    protected void onDestroy();
}

other override

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@Override
public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    if (hasFocus) {
        LanSongUtil.hideBottomUIMenu(this);
    }
}

发表于 | 分类于 ， ， ， 
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Installation failed with message Failed to finalize session : INSTALL_FAILED_INVALID_APK: /data/app/vmdl718805446.tmp/11_youle_v__________ version code 7 inconsistent with 8.
It is possible that this issue is resolved by uninstalling an existing version of the apk if it is present, and then re-installing.

WARNING: Uninstalling will remove the application data!

Do you want to uninstall the existing application?

failure-install-failed-invalid-apk

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I was getting this in Android Studio and all I did to fix it was go to "Build" > "Clean Project" and it just worked.

发表于 | 分类于 ， ， 
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@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == VideoApi.REQUEST_CODE_SELECT_VIDEO && RESULT_OK == resultCode) {
        Uri videoUri = data.getData();
        MediaMetadataRetriever retriever = new MediaMetadataRetriever();
        retriever.setDataSource(videoUri.getPath());
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Caused by: java.lang.IllegalArgumentException
     at android.media.MediaMetadataRetriever.setDataSource(MediaMetadataRetriever.java:73)
     at com.caiyi.youle.MainActivity.onActivityResult(MainActivity.java:433)
     at android.app.Activity.dispatchActivityResult(Activity.java:6479)
     at android.app.ActivityThread.deliverResults(ActivityThread.java:3915)
     at android.app.ActivityThread.handleSendResult(ActivityThread.java:3962) 
     at android.app.ActivityThread.access$1500(ActivityThread.java:180) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1543) 
     at android.os.Handler.dispatchMessage(Handler.java:111) 
     at android.os.Looper.loop(Looper.java:207) 
     at android.app.ActivityThread.main(ActivityThread.java:5791) 
     at java.lang.reflect.Method.invoke(Native Method)

没有申请读写权限
WRITE_EXTERNAL_STORAGE

发表于 | 分类于 ， ， ，

MediaMetadataRetriever

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/**
 * Call it when one is done with the object. This method releases the memory
 * allocated internally.
 */
public native void release();

常量

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/*
 * Do not change these metadata key values without updating their
 * counterparts in include/media/mediametadataretriever.h!
 */
/**
 * The metadata key to retrieve the numeric string describing the
 * order of the audio data source on its original recording.
 */
public static final int METADATA_KEY_CD_TRACK_NUMBER = 0;
/**
 * The metadata key to retrieve the information about the album title
 * of the data source.
 */
public static final int METADATA_KEY_ALBUM           = 1;
/**
 * The metadata key to retrieve the information about the artist of
 * the data source.
 */
public static final int METADATA_KEY_ARTIST          = 2;
/**
 * The metadata key to retrieve the information about the author of
 * the data source.
 */
public static final int METADATA_KEY_AUTHOR          = 3;
/**
 * The metadata key to retrieve the information about the composer of
 * the data source.
 */
public static final int METADATA_KEY_COMPOSER        = 4;
/**
 * The metadata key to retrieve the date when the data source was created
 * or modified.
 */
public static final int METADATA_KEY_DATE            = 5;
/**
 * The metadata key to retrieve the content type or genre of the data
 * source.
 */
public static final int METADATA_KEY_GENRE           = 6;
/**
 * The metadata key to retrieve the data source title.
 */
public static final int METADATA_KEY_TITLE           = 7;
/**
 * The metadata key to retrieve the year when the data source was created
 * or modified.
 */
public static final int METADATA_KEY_YEAR            = 8;
/**
 * The metadata key to retrieve the playback duration of the data source.
 */
public static final int METADATA_KEY_DURATION        = 9; 返回的值是 毫秒
/**
 * The metadata key to retrieve the number of tracks, such as audio, video,
 * text, in the data source, such as a mp4 or 3gpp file.
 */
public static final int METADATA_KEY_NUM_TRACKS      = 10;
/**
 * The metadata key to retrieve the information of the writer (such as
 * lyricist) of the data source.
 */
public static final int METADATA_KEY_WRITER          = 11;
/**
 * The metadata key to retrieve the mime type of the data source. Some
 * example mime types include: "video/mp4", "audio/mp4", "audio/amr-wb",
 * etc.
 */
public static final int METADATA_KEY_MIMETYPE        = 12;
/**
 * The metadata key to retrieve the information about the performers or
 * artist associated with the data source.
 */
public static final int METADATA_KEY_ALBUMARTIST     = 13;
/**
 * The metadata key to retrieve the numberic string that describes which
 * part of a set the audio data source comes from.
 */
public static final int METADATA_KEY_DISC_NUMBER     = 14;
/**
 * The metadata key to retrieve the music album compilation status.
 */
public static final int METADATA_KEY_COMPILATION     = 15;
/**
 * If this key exists the media contains audio content.
 */
public static final int METADATA_KEY_HAS_AUDIO       = 16;
/**
 * If this key exists the media contains video content.
 */
public static final int METADATA_KEY_HAS_VIDEO       = 17;
/**
 * If the media contains video, this key retrieves its width.
 */
public static final int METADATA_KEY_VIDEO_WIDTH     = 18;
/**
 * If the media contains video, this key retrieves its height.
 */
public static final int METADATA_KEY_VIDEO_HEIGHT    = 19;
/**
 * This key retrieves the average bitrate (in bits/sec), if available.
 */
public static final int METADATA_KEY_BITRATE         = 20;
/**
 * This key retrieves the language code of text tracks, if available.
 * If multiple text tracks present, the return value will look like:
 * "eng:chi"
 * @hide
 */
public static final int METADATA_KEY_TIMED_TEXT_LANGUAGES      = 21;
/**
 * If this key exists the media is drm-protected.
 * @hide
 */
public static final int METADATA_KEY_IS_DRM          = 22;
/**
 * This key retrieves the location information, if available.
 * The location should be specified according to ISO-6709 standard, under
 * a mp4/3gp box "@xyz". Location with longitude of -90 degrees and latitude
 * of 180 degrees will be retrieved as "-90.0000+180.0000", for instance.
 */
public static final int METADATA_KEY_LOCATION        = 23;
/**
 * This key retrieves the video rotation angle in degrees, if available.
 * The video rotation angle may be 0, 90, 180, or 270 degrees.
 */
public static final int METADATA_KEY_VIDEO_ROTATION = 24;
/**
 * This key retrieves the original capture framerate, if it's
 * available. The capture framerate will be a floating point
 * number.
 */
public static final int METADATA_KEY_CAPTURE_FRAMERATE = 25;
// Add more here...

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String duration = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);

发表于 | 分类于 ， ， ，

Meizu M1 E i.setType("video/*");只能选择图片，不能选择视频。

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private void startSelectVideoActivity() {
    Intent i = new Intent(Intent.ACTION_PICK, MediaStore.Video.Media.EXTERNAL_CONTENT_URI);
    i.setType("video/*");
    startActivityForResult(i, REQUEST_CODE_SELECT_VIDEO);
    overridePendingTransition(R.anim.slide_in_from_bottom, R.anim.slide_out_to_bottom);
}

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@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == REQUEST_CODE_SELECT_VIDEO && resultCode == RESULT_OK && null != data) {
        Uri selectedVideo = data.getData();
        String videoPath = null;

        if (selectedVideo.getScheme().equalsIgnoreCase("file")) {
            videoPath = selectedVideo.getPath();
        } else {
            String[] filePathColumn = {MediaStore.Video.Media.DATA, MediaStore.Video.Media.DURATION};
            Cursor cursor = getContentResolver().query(selectedVideo,
                    filePathColumn, null, null, null);
            if (cursor != null && cursor.moveToFirst()) {
                int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                videoPath = cursor.getString(columnIndex);
                //duration = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DURATION));
                cursor.close();
            }
        }

返回的 data 是 uri，但是这个 uri 需要解析下(content:// file://)
选择一个视频文件，大部分手机返回的是 file:// 但是锤子手机返回的是 content://

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public static String getPath(Context context,Uri uri) {
    final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
    if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
        if (isExternalStorageDocument(uri)) {
            final String docId = DocumentsContract.getDocumentId(uri);
            final String[] split = docId.split(":");
            final String type = split[0];
            if ("primary".equalsIgnoreCase(type)) {
                return Environment.getExternalStorageDirectory() + "/" + split[1];
            }
        } else if (isDownloadsDocument(uri)) {
            final String id = DocumentsContract.getDocumentId(uri);
            final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
            return getDataColumn(context, contentUri, null, null);
        } else if (isMediaDocument(uri)) {
            final String docId = DocumentsContract.getDocumentId(uri);
            final String[] split = docId.split(":");
            final String type = split[0];

            Uri contentUri = null;
            if ("image".equals(type)) {
                contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
            } else if ("video".equals(type)) {
                contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
            } else if ("audio".equals(type)) {
                contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
            }

            final String selection = "_id=?";
            final String[] selectionArgs = new String[]{
                    split[1]
            };

            return getDataColumn(context, contentUri, selection, selectionArgs);
        }
    } else if ("content".equalsIgnoreCase(uri.getScheme())) {
        return getDataColumn(context, uri, null, null);
    } else if ("file".equalsIgnoreCase(uri.getScheme())) {
        return uri.getPath();
    }
    return null;
}