android 調用系統相機錄像並保存

1、在AndroidManifest.xml中添加如下代碼

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"
    tools:ignore="ProtectedPermissions" />

<application

<provider
    android:authorities="${applicationId}.provider"
    android:name="android.support.v4.content.FileProvider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/provider_paths">
    </meta-data>
</provider>

 </application>
</manifest>

2、在res目錄下新建一個xml文件夾，並且新建一個provider_paths的xml文件

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="external_files" path="."/>
</paths>

3、主文件中打開相機

Intent intent=new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
try {

    //fileUri=Uri.fromFile(createMediaFile());如果這樣寫會報錯
    fileUri= FileProvider.getUriForFile(CameraVideoActivity.this,getApplicationContext().getPackageName() + ".provider",createMediaFile());//這是正確的寫法

} catch (IOException e) {
    e.printStackTrace();
}
intent.putExtra(MediaStore.EXTRA_OUTPUT,fileUri);
intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY,1);

startActivityForResult(intent,1);

4、創建並保存視頻的方法

private File createMediaFile() throws IOException {
    if(Utils.checkSDCardAvaliable()) {
        if ((Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))) {
            // 選擇自己的文件夾
            String path = Environment.getExternalStorageDirectory().getPath() + "/myvideo/";
            // Constants.video_url 是一個常量，代表存放視頻的文件夾
            File mediaStorageDir = new File(path);
            if (!mediaStorageDir.exists()) {
                if (!mediaStorageDir.mkdirs()) {
                    Log.e("TAG", "文件夾創建失敗");
                    return null;
                }
            }

            // 文件根據當前的毫秒數給自己命名
            String timeStamp = String.valueOf(System.currentTimeMillis());
            timeStamp = timeStamp.substring(7);
            String imageFileName = "V" + timeStamp;
            String suffix = ".mp4";
            File mediaFile = new File(mediaStorageDir + File.separator + imageFileName + suffix);
            return mediaFile;
        }
    }
    return null;
}
}

5、重寫onActivityResult方法

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if(requestCode==1)
    {
        if(resultCode==RESULT_OK)
        {
            Toast.makeText(this, "Video saved to:\n" +
                    data.getData(), Toast.LENGTH_LONG).show();
            vv_play.setVideoURI(fileUri);
            vv_play.requestFocus();
        }
    }
}

6、DDMS截圖