Question

我需要知道以下流程是否正常：活动A onPause被调用，因为活动B占据了焦点，但几秒钟后，当活动B完成时和onStop＆amp;调用了活动A的onDestroy，调用了活动A（相同的实例）onResume。我在清单中的活动A defition中有noHistory = true。

我认为，一旦活动失去焦点，就永远不会返回具有noHistory = true的活动的实例。

Answer 1

您在调用ActivityA.onResume()时描述的行为不正确。我怀疑你的AndroidManifest.xml文件中有拼写错误。你能发布并向我们展示吗？

onStop()和onDestroy()的时间安排稍微不那么明确。这是一个有效的示例，但在用户点击后退按钮之前不会调用onStop()和onDestroy()（但永远不会调用onResume()）。如果我在启动ActivityB后调用finish()，那么它们会在之前的ActivityA上调用。

OUTPUT without finish（）：

D/HelloAndroidActivity(13013): [HelloAndroidActivity.java:19:onCreate()] onCreate()com.example.hello.HelloAndroidActivity@4055d2e8
D/HelloAndroidActivity(13013): [HelloAndroidActivity.java:45:onStart()] onStart()com.example.hello.HelloAndroidActivity@4055d2e8
D/HelloAndroidActivity(13013): [HelloAndroidActivity.java:39:onResume()] onResume()com.example.hello.HelloAndroidActivity@4055d2e8
NEXT!
D/HelloAndroidActivity(13013): [HelloAndroidActivity.java:51:onPause()] onPause()com.example.hello.HelloAndroidActivity@4055d2e8
D/GoodbyeAndroidActivity(13013): [GoodbyeAndroidActivity.java:16:onCreate()] onCreate()
D/GoodbyeAndroidActivity(13013): [GoodbyeAndroidActivity.java:32:onStart()] onStart()
D/GoodbyeAndroidActivity(13013): [GoodbyeAndroidActivity.java:26:onResume()] onResume()
[BACK]
D/GoodbyeAndroidActivity(13013): [GoodbyeAndroidActivity.java:38:onPause()] onPause()
D/HelloAndroidActivity(13013): [HelloAndroidActivity.java:57:onStop()] onStop()com.example.hello.HelloAndroidActivity@4055d2e8
D/HelloAndroidActivity(13013): [HelloAndroidActivity.java:63:onDestroy()] onDestroy()com.example.hello.HelloAndroidActivity@4055d2e8
D/GoodbyeAndroidActivity(13013): [GoodbyeAndroidActivity.java:44:onStop()] onStop()
D/GoodbyeAndroidActivity(13013): [GoodbyeAndroidActivity.java:50:onDestroy()] onDestroy()

完成OUTPUT：

D/HelloAndroidActivity(13113): [HelloAndroidActivity.java:19:onCreate()] onCreate()com.example.hello.HelloAndroidActivity@4051b940
D/HelloAndroidActivity(13113): [HelloAndroidActivity.java:45:onStart()] onStart()com.example.hello.HelloAndroidActivity@4051b940
D/HelloAndroidActivity(13113): [HelloAndroidActivity.java:39:onResume()] onResume()com.example.hello.HelloAndroidActivity@4051b940
NEXT!
D/HelloAndroidActivity(13113): [HelloAndroidActivity.java:51:onPause()] onPause()com.example.hello.HelloAndroidActivity@4051b940
D/GoodbyeAndroidActivity(13113): [GoodbyeAndroidActivity.java:16:onCreate()] onCreate()
D/GoodbyeAndroidActivity(13113): [GoodbyeAndroidActivity.java:32:onStart()] onStart()
D/GoodbyeAndroidActivity(13113): [GoodbyeAndroidActivity.java:26:onResume()] onResume()
D/HelloAndroidActivity(13113): [HelloAndroidActivity.java:57:onStop()] onStop()com.example.hello.HelloAndroidActivity@4051b940
D/HelloAndroidActivity(13113): [HelloAndroidActivity.java:63:onDestroy()] onDestroy()com.example.hello.HelloAndroidActivity@4051b940
[BACK]
D/GoodbyeAndroidActivity(13113): [GoodbyeAndroidActivity.java:38:onPause()] onPause()
D/GoodbyeAndroidActivity(13113): [GoodbyeAndroidActivity.java:44:onStop()] onStop()
D/GoodbyeAndroidActivity(13113): [GoodbyeAndroidActivity.java:50:onDestroy()] onDestroy()

HelloAndroidActivity.java：

public class HelloAndroidActivity extends Activity {
    private static final String TAG = "HelloAndroidActivity";

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        Log.d(TAG, "onCreate()" + this);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                Intent i = new Intent(HelloAndroidActivity.this,
                        GoodbyeAndroidActivity.class);
                startActivity(i);
                // Uncomment this:
                 finish();
            }
        });
    }

    @Override
    public void onResume() {
        super.onResume();
        Log.d(TAG, "onResume()" + this);
    }

    @Override
    public void onStart() {
        super.onStart();
        Log.d(TAG, "onStart()" + this);
    }

    @Override
    public void onPause() {
        super.onPause();
        Log.d(TAG, "onPause()" + this);
    }

    @Override
    public void onStop() {
        super.onStop();
        Log.d(TAG, "onStop()" + this);
    }

    @Override
    public void onDestroy() {
        super.onStop();
        Log.d(TAG, "onDestroy()" + this);
    }

}

GoodbyeAndroidActivity.java：

public class GoodbyeAndroidActivity extends Activity {
    private static final String TAG = "GoodbyeAndroidActivity";

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        Log.d(TAG, "onCreate()");
        super.onCreate(savedInstanceState);
        setContentView(R.layout.goodbye);
    }

    @Override
    public void onResume() {
        super.onResume();
        Log.d(TAG, "onResume()");
    }

    @Override
    public void onStart() {
        super.onStart();
        Log.d(TAG, "onStart()");
    }

    @Override
    public void onPause() {
        super.onPause();
        Log.d(TAG, "onPause()");
    }

    @Override
    public void onStop() {
        super.onStop();
        Log.d(TAG, "onStop()");
    }

    @Override
    public void onDestroy() {
        super.onStop();
        Log.d(TAG, "onDestroy()");
    }
}

main.xml中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        >
    <TextView  
        android:id="@+id/hello_text"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="@string/hello"
        />
        <Button  
        android:id="@+id/button"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="NEXT!"
        />
    </LinearLayout>

goodbye.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:id="@+id/hello_text"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Goodbye!!!"
    />
</LinearLayout>

的AndroidManifest.xml：

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.example.hello"
          android:versionCode="1"
          android:versionName="1.0">
        <uses-sdk android:minSdkVersion="10" android:targetSdkVersion="10"/>

        <application android:icon="@drawable/icon" android:label="@string/app_name">
            <activity android:name="com.example.hello.HelloAndroidActivity"
                      android:label="@string/app_name"   android:noHistory="true">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
            <activity android:name="com.example.hello.GoodbyeAndroidActivity">
            </activity>

        </application>
    </manifest>

Answer 2

听起来@Sam Quest有你的答案。在启动新活动之前调用onFinish（）。如果它是由于用户导航而发生的，那么您的活动应该已经完成，但我不知道何时有任何保证。如果您的LoginActivity正在创建活动，那么调用onFinish（）听起来是正确的做法，而不是解决方法。

Answer 3

用于活动结果。那你的问题就解决了。

即使它具有noHistory = true，也返回活动

3 个答案: