Android点击拍摄长按录像代码

以下是一个示例代码，可以在 Android 应用程序中实现点击拍照和长按录制视频的功能：

1. 在布局文件中添加一个 Button 和一个 TextureView 控件：

<Button
    android:id="@+id/btn_capture"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="拍照" />

<TextureView
    android:id="@+id/textureView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

2. 在 Activity 中定义变量和初始化控件：

private static final int REQUEST_VIDEO_CAPTURE = 1;

private TextureView textureView;
private Button btnCapture;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    textureView = findViewById(R.id.textureView);
    btnCapture = findViewById(R.id.btn_capture);

    textureView.setSurfaceTextureListener(textureListener);
    btnCapture.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            takePicture();
        }
    });

    // 设置长按事件监听器
    btnCapture.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View view) {
            startRecording();
            return true;
        }
    });
}

3. 实现拍照功能：

private void takePicture() {
    if (textureView == null) {
        return;
    }
    Bitmap bitmap = textureView.getBitmap();
    if (bitmap == null) {
        return;
    }
    // 保存图片
    String fileName = "IMG_" + System.currentTimeMillis() + ".jpg";
    File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + fileName);
    try {
        FileOutputStream outputStream = new FileOutputStream(file);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
        outputStream.flush();
        outputStream.close();
        Toast.makeText(this, "照片已保存", Toast.LENGTH_SHORT).show();
    } catch (Exception e) {
        e.printStackTrace();
        Toast.makeText(this, "保存照片失败", Toast.LENGTH_SHORT).show();
    }
}

4. 实现录制视频功能：

private MediaRecorder mediaRecorder;
private String videoFileName;

private void startRecording() {
    if (textureView == null) {
        return;
    }
    try {
        mediaRecorder = new MediaRecorder();

        // 设置音频来源和视频来源
        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);

        // 设置输出格式和文件名
        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        videoFileName = "VID_" + System.currentTimeMillis() + ".mp4";
        mediaRecorder.setOutputFile(Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + videoFileName);

        // 设置视频编码器和音频编码器
        mediaRecorder.setVideoEncodingBitRate(10000000);
        mediaRecorder.setVideoFrameRate(30);
        mediaRecorder.setVideoSize(textureView.getWidth(), textureView.getHeight());
        mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);

        // 设置预览
        mediaRecorder.setPreviewDisplay(textureView.getSurfaceTexture());

        // 准备开始录制
        mediaRecorder.prepare();
        mediaRecorder.start();
        Toast.makeText(this, "开始录制", Toast.LENGTH_SHORT).show();
    } catch (Exception e) {
        e.printStackTrace();
        Toast.makeText(this, "录制视频失败", Toast.LENGTH_SHORT).show();
    }
}

private void stopRecording() {
    if (mediaRecorder == null) {
        return;
    }
    mediaRecorder.stop();
    mediaRecorder.release();
    mediaRecorder = null;
    Toast.makeText(this, "录制完成，文件保存在 " + Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + videoFileName, Toast.LENGTH_LONG).show();
}

5. 在 Activity 中添加 onActivityResult() 方法，处理视频录制完成后返回的结果：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_VIDEO_CAPTURE && resultCode == RESULT_OK) {
        Toast.makeText(this, "视频已保存", Toast.LENGTH_SHORT).show();
    }
}

6. 在 startRecording() 方法中添加计时器，当长按时间达到一定时长时停止录制：

private static final int MAX_RECORD_TIME = 10 * 1000; // 最长录制时间为 10 秒

private Timer timer;
private boolean isRecording = false;

private void startRecording() {
    // ...

    isRecording = true;
    timer = new Timer();
    timer.schedule(new TimerTask() {
        @Override
        public void run() {
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    if (isRecording) {
                        stopRecording();
                    }
                }
            });
        }
    }, MAX_RECORD_TIME);
}

private void stopRecording() {
    // ...

    isRecording = false;
    timer.cancel();
}