注意页面关闭, 在onPause时, 释放Visualiser类.
public class MainActivity extends AppCompatActivity {
private static final int CAPTURE_SIZE = 256; // 获取这些数据, 用于显示
private static final int REQUEST_CODE = 0;
// 权限
private static final String[] PERMISSIONS = new String[]{
Manifest.permission.RECORD_AUDIO,
Manifest.permission.MODIFY_AUDIO_SETTINGS
};
@Bind(R.id.main_wv_waveform) WaveformView mWvWaveform; // 波纹视图
private Visualizer mVisualizer; // 音频可视化类
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
RendererFactory rendererFactory = new RendererFactory();
mWvWaveform.setRenderer(rendererFactory.createSimpleWaveformRender(ContextCompat.getColor(this, R.color.colorPrimary), Color.WHITE));
}
@Override protected void onResume() {
super.onResume();
PermissionsChecker checker = new PermissionsChecker(this);
if (checker.lakesPermissions(PERMISSIONS)) {
PermissionsActivity.startActivityForResult(this, REQUEST_CODE, PERMISSIONS);
} else {
startVisualiser();
}
}
@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_CODE && resultCode == PermissionsActivity.PERMISSIONS_DENIED) {
finish();
}
}
// 设置音频线
private void startVisualiser() {
mVisualizer = new Visualizer(0); // 初始化
mVisualizer.setDataCaptureListener(new Visualizer.OnDataCaptureListener() {
@Override
public void onWaveFormDataCapture(Visualizer visualizer, byte[] waveform, int samplingRate) {
if (mWvWaveform != null) {
mWvWaveform.setWaveform(waveform);
}
}
@Override
public void onFftDataCapture(Visualizer visualizer, byte[] fft, int samplingRate) {
}
}, Visualizer.getMaxCaptureRate(), true, false);
mVisualizer.setCaptureSize(CAPTURE_SIZE);
mVisualizer.setEnabled(true);
}
// 释放
@Override protected void onPause() {
if (mVisualizer != null) {
mVisualizer.setEnabled(false);
mVisualizer.release();
}
super.onPause();
}
}
Visualizer类
new Visualizer(0), 初始化; setCaptureSize, 获取波纹数量; setEnabled, 启动监听;
setDataCaptureListener, 第一个参数是回调, 使用WaveFormData或FftData; 第二个是更新率; 第三个是判断使用WaveFormData; 第四个是判断使用FftData, 第三四个均与回调的返回值有关.
3. 波纹视图
页面框架, 分离显示和逻辑, 使用接口渲染, 输入画布Canvas和波纹Waveform.
