Android--多媒体

来源：互联网发布：金融数据建模招聘编辑：程序博客网时间：2024/05/16 05:14

a、加载大图片

public class MainActivity extends Activity {    private ImageView iv;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout. activity_main);        iv = (ImageView) findViewById(R.id. iv);    }    public void loadbigpic(View v){        File file = new File(Environment.getExternalStorageDirectory(), "22.jpg");        Options opts= new Options();        opts. inJustDecodeBounds = true ;        BitmapFactory. decodeFile(file.getAbsolutePath(), opts);        //获取到图片的宽高        int outWidth = opts. outWidth;        int outHeigth = opts. outHeight;        Display display = getWindow().getWindowManager().getDefaultDisplay();        //获取手机屏幕的大小        int width = display. getWidth();        int height = display. getHeight();        int scaleX= outWidth/width;        int scaleY = outHeigth/height;        int scale = scaleX>scaleY?scaleX:scaleY;        if(scale<=0){            scale = 1;        }        opts. inSampleSize = scale;        opts. inJustDecodeBounds = false ;        Bitmap bitmap = BitmapFactory. decodeFile(file.getAbsolutePath(), opts);        iv.setImageBitmap(bitmap);    }}

b、mp3播放

//一种方式privatebooleanisplaying = false;public void playMusic() {        if (isplaying ) {        return;        }        isplaying = true ;        mMp = MediaPlayer.create(getApplicationContext(), R.raw.qqqg);        mMp.start();        mMp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {@Overridepublic void onCompletion(MediaPlayer mp) {        isplaying = false ;        }        });        }//另一种方式public class MainActivity extends Activity {    private MediaPlayer mp;    private EditText et_path ;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout. activity_main);        et_path = (EditText) findViewById(R.id.et_path);        mp = new MediaPlayer();//媒体播放器    }    public void start(View v){        String path = et_path.getText().toString();        if(TextUtils. isEmpty(path)){            Toast. makeText(this, "歌曲路径不能为空", Toast.LENGTH_SHORT).show();            return;        }        mp.reset(); //重置        try {            mp.setDataSource(path);            prepareAsync();        } catch (Exception e) {            e.printStackTrace();        }    }    private void prepareAsync() {        mp.prepareAsync(); //异步准备        //从开始的位置开始播放        mp.seekTo(0);        //设置准备完成监听        mp.setOnPreparedListener( new MediaPlayer.OnPreparedListener() {            //准备完成            @Override            public void onPrepared(MediaPlayer mp) {                mp.start();            }        });    }    public void pausemoveon(View v){        Button bt = (Button)v;        if(mp .isPlaying()){//判断文件是否正在播放            //暂停 文字变成继续            mp.pause();            bt.setText( "继续");        } else{            //继续播放            mp.start();            bt.setText( "暂停");        }    }    public void stop(View v){        mp.stop();    }    public void replay(View v){        mp.stop();        prepareAsync();    }    @Override    protected void onDestroy() {        super.onDestroy();        mp.release(); //释放资源        mp = null;    }}

c、mp4播放

public class MainActivity extends Activity {    private SurfaceView surfaceView;    private MediaPlayer mp ;    private EditText et_path ;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout. activity_main);        et_path = (EditText) findViewById(R.id.et_path);        //找到视频播放的控件        surfaceView = (SurfaceView) findViewById(R.id.sv);        //进行初始化        surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);//把视频直接显示出来        //保证手机的屏幕一直高亮（任何的控件都可以）        surfaceView.setKeepScreenOn(true);        mp = new MediaPlayer();    }    public void play(View v){        String path = et_path.getText().toString();        if(TextUtils. isEmpty(path)){            Toast. makeText(this, "播放文件的路径不能为空" , Toast.LENGTH_SHORT ).show();            return;        }        mp.reset();        try {            mp.setDataSource(path);            prepareAsync();        } catch (Exception e) {            e.printStackTrace();        }    }    private void prepareAsync() {        //把媒体播放器和SurfaceView关联起来        mp.setDisplay( surfaceView.getHolder());//设置显示        mp.prepareAsync();        mp.seekTo(0);        mp.setOnPreparedListener( new MediaPlayer.OnPreparedListener() {            @Override            public void onPrepared(MediaPlayer mp) {                mp.start();            }        });    }    public void pausemove(View v){        Button bt = (Button)v;        if(mp .isPlaying()){            mp.pause();            bt.setText( "继续");        } else{            mp.start();            bt.setText( "暂停");        }    }    public void stop(View v){        mp.stop();    }    public void replay(View v){        mp.stop();        prepareAsync();    }    @Override    protected void onDestroy() {        super.onDestroy();        mp.release();        mp = null;    }}

d、拍照

public class MainActivity extends Activity {    private SurfaceView surfaceView ;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout. activity_main);        surfaceView = (SurfaceView) findViewById(R.id.surfaceView);        surfaceView.setKeepScreenOn(true);// 保持屏幕高亮        // 获取SurfaceHolder        SurfaceHolder holder = surfaceView.getHolder();        // 让数据直接输出        holder. setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);        // 给SurfaceView 添加创建监听        holder.addCallback( new MyCallBack());    }    private Camera camera ;    private class MyCallBack implements Callback {        @Override        public void surfaceCreated(SurfaceHolder holder) {            /**             * 步骤： 1 打开相机 2 设置预览显示 3 开始预览             */            try {                camera = Camera.open();                // 2 设置预览显示                camera.setPreviewDisplay(holder);                // 3 开始预览                camera.startPreview();            } catch (Exception e) {                e.printStackTrace();            }        }        @Override        public void surfaceChanged(SurfaceHolder holder, int format, int width,                                   int height) {}        @Override        public void surfaceDestroyed(SurfaceHolder holder) {            camera.release();// 释放硬件资源            camera = null ;        }    }    public void focus(View v) {        // 对焦        camera.autoFocus(null);// 自动对焦都是硬件来完成    }    public void takepictrue(View v) {        // 拍照        // shutter 快门, raw 相机捕获的原始数据, jpeg 相机处理后的数据 其实这三个参数都是接口        camera.takePicture(null, null, new MyPictureCallback());    }    // 相机处理完成照片后的监听类    private class MyPictureCallback implements PictureCallback {        // 处理完成照片后 自动调用该方法 相机只能同时干一件事件 在处理照片的时候 相机是被占用的        @Override        public void onPictureTaken(byte[] data, Camera camera) {            try {                // 把相机的数据保存在 sdcard 权限                File file = new File(Environment.getExternalStorageDirectory(),                        "sz08.jpg");                FileOutputStream fos = new FileOutputStream(file);                fos.write(data);                fos.close();                // 重新预览                camera.startPreview();            } catch (Exception e) {                e.printStackTrace();            }        }    }}

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