切换到活动时，我的Android应用程序崩溃

adb logcat

@Override
protected void onResume() {
    super.onResume();
    // 恢复活动时需要的操作
}

@Override
protected void onPause() {
    super.onPause();
    // 暂停活动时释放资源
}

<activity
    android:name=".YourActivity"
    android:configChanges="orientation|screenSize">
</activity>

if (yourObject != null) {
    yourObject.doSomething();
}

try {
    // 可能抛出异常的代码
} catch (NullPointerException e) {
    e.printStackTrace();
    // 处理异常
}

public class MainActivity extends AppCompatActivity {
    private YourResource yourResource;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        yourResource = new YourResource();
    }

    @Override
    protected void onResume() {
        super.onResume();
        yourResource.resume();
    }

    @Override
    protected void onPause() {
        super.onPause();
        yourResource.pause();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        yourResource.release();
    }
}