「React Native」Android返回键监听
16lz
2021-01-23
在需要做监听的js中添加
componentWillMount() { if (Platform.OS === 'android') { BackHandler.addEventListener('hardwareBackPress', this.onBackHandler); } } componentWillUnmount() { if (Platform.OS === 'android') { BackHandler.removeEventListener('hardwareBackPress', this.onBackHandler); } } onBackHandler = () => { // this.onMainScreen and this.goBack are just examples, you need to use your own implementation here // Typically you would use the navigator here to go to the last state. if (!this.onMainScreen()) { this.goBack(); return true; } return false; };RN的容器Activity实现DefaultHardwareBackBtnHandler接口
public class XXXActivity extends AppCompatActivity implements DefaultHardwareBackBtnHandler { //... private ReactInstanceManager mReactInstanceManager; @Override public void invokeDefaultOnBackPressed() { if (mReactInstanceManager != null) { mReactInstanceManager.onBackPressed(); } else { super.onBackPressed(); } } //... }RN的容器为Fragment时，DefaultHardwareBackBtnHandler没起作用
这时我们需要在该Fragment中添加接收返回事件的代码
public boolean onKeyUp(int keyCode, KeyEvent event) { if (mReactInstanceManager != null) { switch (keyCode) { //... case KeyEvent.KEYCODE_BACK: { mReactInstanceManager.onBackPressed(); return true; } } } return false; }并且在Activity中向该Fragment注入onkeyUp事件
@Override public boolean onKeyUp(int keyCode, KeyEvent event) { return fragment.onKeyUp(keyCode, event) || super.onKeyUp(keyCode, event); }更多相关文章
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