我正在尝试覆盖来电屏幕 - 我知道我无法更改它，所以我正在尝试在顶部弹出一个 Activity 。

我的代码工作正常，除非手机闲置了几分钟。

我的代码:

AndroidManifest.xml :

<?xml version="1.0" encoding="utf-8" ?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.example.myfirstapp"
      android:versionCode="7"
      android:versionName="7">
    <uses-sdk android:minSdkVersion="7" android:targetSdkVersion="10"></uses-sdk>
    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
    <uses-permission android:name="android.permission.MODIFY_PHONE_STATE"/>
    <uses-permission android:name="android.permission.CALL_PHONE" />

    <application android:label="@string/app_name" android:icon="@drawable/ic_launcher">
        <receiver android:name=".MyPhoneBroadcastReceiver" android:enabled="true">
            <intent-filter android:priority="99999">
                <action android:name="android.intent.action.PHONE_STATE" />
            </intent-filter>
        </receiver>
        <activity
            android:name=".Call" >
        </activity>
    </application>
</manifest>

MyPhoneBroadcastReceiver.java:

public class MyPhoneBroadcastReceiver extends BroadcastReceiver{

    public void onReceive(final Context context, Intent intent) {

        Thread pageTimer = new Thread(){
            public void run(){
                try{
                    sleep(700);
                } catch (InterruptedException e){
                    e.printStackTrace();
                } finally {
                    Intent i = new Intent();
                    i.setClass(context, Call.class);
                    i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    i.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);  
                    i.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
                    i.putExtra("INCOMING_NUMBER", incomingNumber);
                    i.setAction(Intent.ACTION_MAIN);
                    i.addCategory(Intent.CATEGORY_LAUNCHER);
                    context.startActivity(i);
                }
            }
        };
        pageTimer.start();
    }
}

调用.java:

package com.example.myfirstapp;

import android.app.Activity;
import android.os.Bundle;

public class Call extends Activity{
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow(). addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
        getWindow().addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
        getWindow().addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        setContentView(R.layout.main);
    }
}

顺便说一句 - 我尝试等待屏幕在 sleep (700) 之前唤醒，但没有帮助 (在 MyPhoneBroadcastReceiver.java 中)

...
try {      
    if (pm.isScreenOn()) {
        sleep(700);
    } else {
        while (!pm.isScreenOn()) {
            // Do nothing...
        }
        sleep(700);
    }
}
...

最佳答案

当手机屏幕关闭且有来电时，有更多工作要做(唤醒、处理键盘锁 View ...)，因此通话中的 Activity 需要更长的时间才能显示，这会导致如果您的通话 Activity 开始时间早于通话 Activity 开始时间 --> 通话 Activity 在最前面
没有确切的时间显示通话中的 Activity (您已经尝试过，发现 700 毫秒是不够的)

我的解决方案:继续跟踪调用 Activity 的状态:

• 如果它仍然在顶部并且用户没有关闭它(或任何条件 解雇)，只需使用处理程序继续跟踪
• 如果有任何其他 Activity 转到前台，然后调用 Activity 尝试回到顶部

我的示例 Activity :

public class MainActivity extends Activity {
    private ActivityManager mActivityManager;
    private boolean mDismissed = false;

    private static final int MSG_ID_CHECK_TOP_ACTIVITY = 1;
    private static final long DELAY_INTERVAL = 100;

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

        Window window = getWindow();
        window.addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);

        mActivityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
        mHandler.sendEmptyMessageDelayed(MSG_ID_CHECK_TOP_ACTIVITY,
                DELAY_INTERVAL);
    }

    private Handler mHandler = new Handler() {
        public void handleMessage(android.os.Message msg) {
            if (msg.what == MSG_ID_CHECK_TOP_ACTIVITY && !mDismissed) {
                List<RunningTaskInfo> tasks = mActivityManager
                        .getRunningTasks(1);
                String topActivityName = tasks.get(0).topActivity
                        .getClassName();
                if (!topActivityName.equals(MainActivity.this
                        .getComponentName().getClassName())) {
                    // Try to show on top until user dismiss this activity
                    Intent i = new Intent();
                    i.setClass(MainActivity.this, MainActivity.class);
                    i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    i.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
                    startActivity(i);
                }
                sendEmptyMessageDelayed(MSG_ID_CHECK_TOP_ACTIVITY,
                        DELAY_INTERVAL);
            }
        };
    };

}

关于android - 来电屏幕上的 Activity 弹出窗口，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14338526/