Android 拍照视频音频

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1. 调用摄像头添加图像

1. 布局文件

布局文件：两个 button 分别为拍照和从相册中选择

    <LinearLayout        android:gravity="center"        android:orientation="horizontal"        android:layout_width="match_parent"        android:layout_height="wrap_content">    <Button        android:id="@+id/bt_get_camera"        android:layout_width="wrap_content"        android:layout_gravity="center"        android:layout_height="wrap_content"        android:text="拍照" />    <Button        android:text="从相册中选择"        android:id="@+id/bt_chose_album"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    </LinearLayout>    <LinearLayout        android:gravity="center"        android:layout_width="match_parent"        android:layout_height="match_parent">        <ImageView            android:id="@+id/iv_img"            android:src="@mipmap/ic_launcher"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />    </LinearLayout>

2. 初始化视图对象并添加点击事件

    /**     * @param view     */    @Override    public void onClick(View view) {        switch (view.getId()) {            case R.id.bt_get_camera:                Toast.makeText(this, "camera", Toast.LENGTH_SHORT).show();                takePhoto();//执行拍照方法                break;         }    }

3. 启动 intent 拍照实现逻辑

步骤：

1. 创建 outputImage对象，保存相机拍摄的照片
2. 根据不同版本，确定获取imageUri 的方法
3. 启动相机
   
   • 启动 intent ：android.media.action.IMAGE_CAPTURE
   • 调用 putExtra() 传入要保存的图片uri
   • 使用带结果回调的方式，启动 intent：startActivityForResult(intent, TAKE_PHOTO);

    /**     * 调用摄像头拍照     */    private Uri imageUri;    private void takePhoto() {        ///storage/emulated/0/Android/data/com.example.a08_2camera/cache/output_image.jpg        //1.         File outputImage = new File(getExternalCacheDir(), "output_image.jpg");        if (outputImage.exists()) {            outputImage.delete();        }        try {            outputImage.createNewFile();        } catch (IOException e) {            e.printStackTrace();        }        //2. 根据不同版本，确定 uri        if (Build.VERSION.SDK_INT >= 24) {//6.0及以上版本            imageUri = FileProvider.getUriForFile(MainActivity.this, "com.example.cameraalbumtest.fileprovider", outputImage);            Log.d("MainActivity", "Build.VERSION.SDK_INT:" + Build.VERSION.SDK_INT);        } else {            imageUri = Uri.fromFile(outputImage);            Log.d("MainActivity", "Build.VERSION.SDK_INT:" + Build.VERSION.SDK_INT);        }        Log.d("MainActivity", "outputImage:" + outputImage.toString());        //3. 启动相机        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);        startActivityForResult(intent, TAKE_PHOTO);    }

4. 编写 Intent 调用响应函数

拍照成功，将调用以下方法，将保存的照片读取出来，显示到 imageview 中

    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {//        super.onActivityResult(requestCode, resultCode, data);        switch (requestCode) {            case TAKE_PHOTO: //请求码是TAKE_PHOTO                if (resultCode == RESULT_OK) {                    try {                        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));                        iv_img.setImageBitmap(bitmap);//设置显示图片                    } catch (FileNotFoundException e) {                        e.printStackTrace();                    }                }                break;    }}

5. 编写 provider 相关代码

在第三步的获取图片 uri 时，若版本大于6.0 则使用 provider，因此需要在 manifest 中注册 provider

1. 注册 provider

        <provider            android:authorities="com.example.cameraalbumtest.fileprovider"            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/file_paths"/>

2. 创建资源文件 xml

新建 res/file_paths.xml

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

6. manifest添加读写sd卡权限

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

7. 效果

2. 调用相册添加头像

简介：点击按钮，调用相册，选择图片后设置到imageview中

1. 布局文件，同上

2. 添加相应事件

    public void onClick(View view) {        switch (view.getId()) {//1. 调用相机拍照            case R.id.bt_get_camera:                Toast.makeText(this, "camera", Toast.LENGTH_SHORT).show();                takePhoto();                break;            //2. 打开相册            case R.id.bt_chose_album:                Toast.makeText(this, "chose ", Toast.LENGTH_SHORT).show();                chosePhoto();                break;        }    }

3. chosePhoto实现函数

1. 授予运行时权限
2. 执行打开相册功能函数

    private void chosePhoto() {        if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},1);        } else {            openAlbum();        }    }

4. 打开相册功能函数代码

使用带回调方式启动intent

    private void openAlbum() {        Intent intent = new Intent("android.intent.action.GET_CONTENT");        intent.setType("image/*");        startActivityForResult(intent, CHOSE_PHOTE);    }

5. Intent响应完成的回调函数

根据不同版本，确定不同方式获取intent返回的图片

• 当系统版本>=4.4 调用handleImageOnKitKat(data);
• 当系统版本<4.4 handleImageBeforeKitKat(data);

    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {//        super.onActivityResult(requestCode, resultCode, data);        switch (requestCode) {            ......            case CHOSE_PHOTE:                if (resultCode == RESULT_OK) {                    if (Build.VERSION.SDK_INT >= 19) {//4.4及以上系统                        handleImageOnKitKat(data);                    } else {//4.4  及以下系统                        handleImageBeforeKitKat(data);                    }                }                break;        }    }

6. 获取intent返回的图片

根据不同版本，确定不同方式获取intent返回的图片

1. Android4.4及以上系统

1. 判断intent返回的data类型，并根据不同类型获取相应的uri
   
   • doc型uri
     
     • com.android.providers.media.documents
     • com.android.providers.downloads.documents
   • content型uri
   • file类型uri
2. 显示图片到imageview

    private void handleImageOnKitKat(Intent data) {        String imagePath = null;        Uri uri = data.getData();        if (DocumentsContract.isDocumentUri(MainActivity.this, uri)) {//如果是doc类型的uri            String docId = DocumentsContract.getDocumentId(uri);            if ("com.android.providers.media.documents".equalsIgnoreCase(uri.getAuthority())) {                String id = docId.split(":")[1];//解析出数字格式的id                String selection = MediaStore.Images.Media._ID + "=" + id;                imagePath = getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection);            } else if ("com.android.providers.downloads.documents".equals(uri.getAuthority())) {                Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(docId));                imagePath = getImagePath(contentUri, null);            }        } else if ("content".equalsIgnoreCase(uri.getScheme())) {//如果是content类型的uri            imagePath = getImagePath(uri, null);        } else if ("file".equalsIgnoreCase(uri.getScheme())) {  //如果是file 类型的uri            imagePath = uri.getPath();        }        displayImage(imagePath);    }

2. Android4.4以前系统

    private void handleImageBeforeKitKat(Intent data) {        Uri uri = data.getData();        String imagePath = getImagePath(uri, null);        displayImage(imagePath);    }

3. 获取图片地址

    private String getImagePath(Uri uri, String selection) {        String path = null;        //通过uri和selection 获取真实图片路径        Cursor cursor = getContentResolver().query(uri, null, selection, null, null);        if (cursor != null && cursor.moveToFirst()) {            path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));            cursor.close();        }        return path;    }

4. 显示图片

    private void displayImage(String imagePath) {        if (imagePath != null) {            Bitmap bitmap = BitmapFactory.decodeFile(imagePath);            iv_img.setImageBitmap(bitmap);        } else {            Toast.makeText(this, "fail to get image", Toast.LENGTH_SHORT).show();        }    }

7. 效果：

3. 播放音频

mediaPlayer API说明

方法 功能描述 setDataSource(） 设置播放音频的文件位置 prepare() 开始播放前调用该方法完成准备工作 start() 开始或者继续播放 pause() 暂停播放 reset() 对mediaplayer对象重置到刚刚创建时的状态 seekTo() 跳转到指定位置播放 stop() 停止播放音频 release() 释放mediaplayer相关的资源 isPlaying() 判断mediaplayer是否正在播放视频 getDuration() 获取载入的视频的长度

功能：播放，暂停，重新播放，显示播放进度

1. 布局文件

    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content">        <Button            android:id="@+id/bt_play"            android:textAllCaps="false"            android:text="Play"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />        <Button            android:id="@+id/bt_replay"            android:textAllCaps="false"            android:text="RePlay"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />        <Button            android:id="@+id/bt_pause"            android:textAllCaps="false"            android:text="Pause"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />    </LinearLayout>    <SeekBar        android:id="@+id/sb_audio_progress"        android:layout_width="match_parent"        android:layout_height="wrap_content" />    <TextView        android:id="@+id/tv_audio_info"        android:hint="info"        android:padding="10dp"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />

2. onCreate()

1. 初始化视图对象
2. 添加点击事件
3. 运行时权限检查

    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        bt_play = (Button) findViewById(R.id.bt_play);        bt_replay = (Button) findViewById(R.id.bt_replay);        bt_pause = (Button) findViewById(R.id.bt_pause);        sb_audio_progress = (SeekBar)findViewById(R.id.sb_audio_progress);        tv_audio_info = (TextView) findViewById(R.id.tv_audio_info);        bt_replay.setOnClickListener(this);        bt_pause.setOnClickListener(this);        bt_play.setOnClickListener(this);        checkRunTimePermission();    }

3. 检查并申请运行时权限

• 若没有授予权限，申请权限
• 若已经授予过权限，执行数据初始化

       private void checkRunTimePermission() {        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);        } else {            initAudioData();        }    }

判断权限授予情况

    @Override    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {        super.onRequestPermissionsResult(requestCode, permissions, grantResults);        switch (requestCode) {            case REQUEST_WRITE_SD:                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {                    initVideoData();                } else {                    Toast.makeText(this, "申请权限被拒绝，关闭程序", Toast.LENGTH_SHORT).show();                    finish();//关闭                }                break;        }    }

4. 初始化音频数据

• 1. 设置视频路径
• 1. textview显示音频信息

      private void initAudioData() {        File file = new File(Environment.getExternalStorageDirectory() + "/Download/", "live.mp3");      //  File file = new File(Environment.getExternalStorageDirectory() , "zj.mp3");        try {            mediaPlayer = new MediaPlayer();            mediaPlayer.setDataSource(file.getPath());            tv_audio_info.setText(file.getPath());            mediaPlayer.prepare();            int duration = mediaPlayer.getDuration();            sb_audio_progress.setMax(duration);            //handler.sendEmptyMessageDelayed(UPDATE_PROGRESS,500);        } catch (IOException e) {            e.printStackTrace();        }    }

5. onClick 响应播放动作

    @Override    public void onClick(View view) {        switch (view.getId()){            case R.id.bt_play:                if(!mediaPlayer.isPlaying()) {                    mediaPlayer.start();                    handler.removeMessages(UPDATE_PROGRESS);                    handler.sendEmptyMessageDelayed(UPDATE_PROGRESS,100);                }                break;            case R.id.bt_pause:                if(mediaPlayer.isPlaying()) {                    mediaPlayer.pause();                    handler.removeMessages(UPDATE_PROGRESS);                }else {                    mediaPlayer.start();                    handler.removeMessages(UPDATE_PROGRESS);                    handler.sendEmptyMessageDelayed(UPDATE_PROGRESS,100);                }                break;            case R.id.bt_replay://                if(mediaPlayer.isPlaying()) {//                }                    mediaPlayer.reset();                    initAudioData();                    mediaPlayer.start();                    handler.removeMessages(UPDATE_PROGRESS);                    handler.sendEmptyMessageDelayed(UPDATE_PROGRESS,100);                break;        }    }

6. onDestroy中释放资源回收handler

    @Override    protected void onDestroy() {        //1. 释放资源        if(mediaPlayer!=null) {            mediaPlayer.stop();            mediaPlayer.release();        }        //2. 回收消息        handler.removeCallbacksAndMessages(UPDATE_PROGRESS);    }

7. 使用handler同步显示信息更新seekbar

    private Handler handler = new Handler(){        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            switch (msg.what){                case 1:                    int currentPosition = mediaPlayer.getCurrentPosition();                    sb_audio_progress.setProgress(currentPosition);                    Log.d("MainActivity", "handler update ");                    handler.removeMessages(UPDATE_PROGRESS);                    handler.sendEmptyMessageDelayed(UPDATE_PROGRESS,100);                    tv_audio_info.setText("进度："+currentPosition+"/"+mediaPlayer.getDuration());                    break;            }        }    };

8. 添加权限

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

9. 效果

4. 播放视频

视频播放的常用函数（VideoView）

方法 功能 setVideoPath() 设置要播放的视频的文件位置 start() 开始或者继续播放视频 pause() 暂停播放视频 seekTo() 从指定位置播放视频 resume() 将视频从头开始播放 isplaying（） 判断当前视频是否正在播放 getDuration() 获取视频时长

点击不同按钮，分别实现本地视频，播放，暂停，重新播放

1. 布局文件

    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content">        <Button            android:text="Play"            android:id="@+id/bt_play"            android:textAllCaps="false"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />        <Button            android:text="Pause"            android:id="@+id/bt_pause"            android:textAllCaps="false"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />        <Button            android:text="RePlay"            android:id="@+id/bt_replay"            android:textAllCaps="false"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />    </LinearLayout>    <VideoView        android:id="@+id/vv_video_view"        android:layout_width="match_parent"        android:layout_height="wrap_content" />

2. onCreate中

1. 初始化视图对象
2. 添加点击事件
3. 运行时权限检查

    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);         vv_video_view= (VideoView) findViewById(R.id.vv_video_view);        bt_play = (Button)findViewById(R.id.bt_play);        bt_replay = (Button)findViewById(R.id.bt_replay);        bt_pause = (Button)findViewById(R.id.bt_pause);        bt_pause.setOnClickListener(this);        bt_replay.setOnClickListener(this);        bt_play.setOnClickListener(this);        checkRunTimePermission();//运行时权限    }

3. 运行时权限检查

• 没有权限，申请
• 有权限，执行初始化视频数据

    private void checkRunTimePermission() {        if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)!= PackageManager.PERMISSION_GRANTED) {            ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},1);        }else {            initVideoData();//        }    }

权限申请响应

    @Override    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {        super.onRequestPermissionsResult(requestCode, permissions, grantResults);        switch (requestCode){            case REQUEST_WRITE_SD:                if(grantResults.length>0&&grantResults[0]==PackageManager.PERMISSION_GRANTED) {                    initVideoData();                }else {                    Toast.makeText(this, "申请权限被拒绝，关闭程序", Toast.LENGTH_SHORT).show();                    finish();//关闭                }                break;        }    }

4. 初始化视频数据

    private void initVideoData() {        //File move = new File(Environment.getExternalStorageDirectory()+"/Download/","move.mp4");        File move = new File(Environment.getExternalStorageDirectory(),"historymap.mp4");        String path = move.getPath();        vv_video_view.setVideoPath(move.getPath());    }

5. button点击事件

根据需求实现播放，暂停，重新播放功能
并发送handler实时同步视频播放状态

    @Override    public void onClick(View view) {        switch (view.getId()) {            case R.id.bt_play:                Toast.makeText(this, "play", Toast.LENGTH_SHORT).show();                if (!vv_video_view.isPlaying()) {                    vv_video_view.start();                    handler.removeMessages(UPDATE_INFO);                    handler.sendEmptyMessageDelayed(UPDATE_INFO, 100);                }                break;            case R.id.bt_pause:                if (vv_video_view.isPlaying()) {                    vv_video_view.pause();                    handler.removeMessages(UPDATE_INFO);                } else {                    vv_video_view.start();                    handler.removeMessages(UPDATE_INFO);                    handler.sendEmptyMessageDelayed(UPDATE_INFO, 100);                }                break;            case R.id.bt_replay:                if (vv_video_view.isPlaying()) {                    vv_video_view.resume();                } else {                    vv_video_view.resume();                    vv_video_view.start();                }                handler.removeMessages(UPDATE_INFO);                handler.sendEmptyMessageDelayed(UPDATE_INFO, 100);                break;        }    }

6. 使用handler显示视屏播放进度

    private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            switch (msg.what) {                case UPDATE_INFO:                    int duration = vv_video_view.getDuration();                    int currentPosition = vv_video_view.getCurrentPosition();                    tv_video_info.setText("进度：" + currentPosition + "/" + duration);                    handler.removeMessages(UPDATE_INFO);                    handler.sendEmptyMessageDelayed(UPDATE_INFO, 100);                    break;            }        }    };

7. onDestroy中释放资源回收handler

    @Override    protected void onDestroy() {        super.onDestroy();        //1. 释放视屏资源        if (vv_video_view != null) {            vv_video_view.suspend();        }        //2. 移除handler消息        handler.removeCallbacksAndMessages(UPDATE_INFO);    }

8. 读写sd权限

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

9.效果