android - OnResume 之后立即调用 OnPause

Question

编辑* 在 Android 设备上测试时出现此问题。在 emultor 上测试时不会出现此问题。

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我正在开始一项新 Activity ，我看到在调用 onResume 之后立即调用了 onPause。如果我查看日志，它会在 onResume 之后进入空闲状态。因此在调用 onResume 后立即导致 onPause。

调用方 Activity - 通过 Intent 在 onClick 上调用 MainActivity。

public class TestActivity extends AppCompatActivity implements View.OnClickListener{

    String TAG = "acr";
    Button testBtn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test);
        testBtn = (Button) findViewById(R.id.testBtn);
        testBtn.setOnClickListener(this);
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.i(TAG, "on pause called on TestActivity ");
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.i(TAG, "on resume called on  TestActivity ");
    }

    @Override
    public void onClick(View v) {
        switch(v.getId()){
            case R.id.testBtn:
                Intent mainIntent = new Intent(this, MainActivity.class);
                TestActivity.this.startActivity(mainIntent);
                break;
        }
    }
}

有错误的 Activity

public class MainActivity extends AppCompatActivity{

    public static final String TAG = "acrx";


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


    @Override
    protected void onPause() {
        super.onPause();
        Log.i(TAG, "on pause called on mainactivity");
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.i(TAG, "on resume Called on Main activity");
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.i(TAG, "on stop Called on Main activity");
    }
}

日志

12-06 23:24:19.751 22983-22983/com.example.m1alesis.smartcardreader I/acrx: on resume Called on Main activity
12-06 23:24:19.751 22983-22983/com.example.m1alesis.smartcardreader D/SecWifiDisplayUtil: Metadata value : SecSettings2
12-06 23:24:19.751 22983-22983/com.example.m1alesis.smartcardreader D/ViewRootImpl: #1 mView = com.android.internal.policy.PhoneWindow$DecorView{5ce8491 I.E...... R.....ID 0,0-0,0}
12-06 23:24:19.781 22983-23012/com.example.m1alesis.smartcardreader D/mali_winsys: EGLint new_window_surface(egl_winsys_display*, void*, EGLSurface, EGLConfig, egl_winsys_surface**, egl_color_buffer_format*, EGLBoolean) returns 0x3000,  [1440x2560]-format:1
12-06 23:24:19.811 22983-22983/com.example.m1alesis.smartcardreader W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
12-06 23:24:19.831 22983-22983/com.example.m1alesis.smartcardreader D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 96 - 0, 0) vi=Rect(0, 96 - 0, 0) or=1
12-06 23:24:19.871 22983-23012/com.example.m1alesis.smartcardreader D/OpenGLRenderer: endAllActiveAnimators on 0x7f9c17ec00 (RippleDrawable) with handle 0x7f9ccc8b60
12-06 23:24:19.871 22983-22983/com.example.m1alesis.smartcardreader I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@fa2f707 time:376798424
12-06 23:24:20.131 22983-22983/com.example.m1alesis.smartcardreader V/ActivityThread: updateVisibility : ActivityRecord{e78cff6 token=android.os.BinderProxy@a67fd36 {com.example.m1alesis.smartcardreader/com.example.m1alesis.smartcardreader.TestActivity}} show : false
12-06 23:24:31.561 22983-22983/com.example.m1alesis.smartcardreader I/acrx: on pause called on mainactivity
12-06 23:24:31.701 22983-22983/com.example.m1alesis.smartcardreader I/acrx: on resume Called on Main activity
12-06 23:24:31.721 22983-22983/com.example.m1alesis.smartcardreader I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@fa2f707 time:376810271

Answer 1

我有同样的问题，对我来说，它与 Activity 启动和屏幕不亮有关 - 我只是在我关闭屏幕后才看到它(例如，在触摸电源按钮然后回到家以再次恢复后) .

这是其他人也看到的行为 - 我发现这个问题和答案有有用的引用:OnPause and OnStop() called immediately after starting activity

帮助我理解该行为的关键引用是:

Keep in mind that onResume is not the best indicator that your activity is visible to the user; a system window such as the keyguard may be in front. Use onWindowFocusChanged(boolean) to know for certain that your activity is visible to the user