Android如何在App中启动系统闹钟

由于不同Android手机厂商提供的系统闹钟包名都不一致，所以只能通过过滤当前手机所有的应用，以确定闹钟应用的包名，进而启动它。

这里采用的过滤规则是：系统应用 && 应用的PackageName包含"widget" 和 "clock"

1、布局文件  activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:paddingBottom="@dimen/activity_vertical_margin"
  android:paddingLeft="@dimen/activity_horizontal_margin"
  android:paddingRight="@dimen/activity_horizontal_margin"
  android:paddingTop="@dimen/activity_vertical_margin"
  tools:context=".MainActivity"> 

  <Button
    android:id="@+id/start_system_clock_bt"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="启动系统闹钟" /> 

</RelativeLayout> 

2、MainActivity.java

package com.demo.cxc.systemclocksample; 

import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast; 

import java.util.ArrayList;
import java.util.List; 

public class MainActivity extends AppCompatActivity {
  private Button startSystemClockButton = null; 

  private List<PackageInfo> allPackageInfos;//系统安装所有软件
  private List<PackageInfo> clockPackageInfos;//系统时钟软件 

  private static final int HANDLE_MESSAGE_KEY = 1001;
  private Handler myHandler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
      super.handleMessage(msg);
      if (msg != null) {
        switch (msg.what) {
          case HANDLE_MESSAGE_KEY:
            Toast.makeText(getApplicationContext(), "--app scan over--", Toast.LENGTH_SHORT).show();
            Log.d("CXC", "--app scan over--");
            break; 

          default:
            break; 

        } 

      } 

    }
  }; 

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

    //begin scan installed applications;
    //// TODO: 16/1/15
    new Thread(new ScanInstalledAppsRunnable()).start();
  } 

  private void initViews() {
    startSystemClockButton = (Button) findViewById(R.id.start_system_clock_bt);
    startSystemClockButton.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        //// TODO: 16/1/15
        startSystemClock();
      }
    });
  } 

  private void initData() {
    clockPackageInfos = new ArrayList<PackageInfo>();
  } 

  class ScanInstalledAppsRunnable implements Runnable {
    @Override
    public void run() {
      allPackageInfos = getPackageManager()
          .getInstalledPackages(0); 

      if (allPackageInfos == null || allPackageInfos.size() == 0) {
        //// TODO: 16/1/15 todo nothing
        return;
      } 

      if (clockPackageInfos == null) {
        clockPackageInfos = new ArrayList<PackageInfo>();
      } 

      PackageInfo tempPackageInfo = null;
      for (int i = 0; i < allPackageInfos.size(); i++) {
        tempPackageInfo = allPackageInfos.get(i);
        if (tempPackageInfo != null) { 

          if (isSystemApplication(tempPackageInfo.applicationInfo) &&
              isClockApplication(tempPackageInfo.packageName)) {
            clockPackageInfos.add(tempPackageInfo);
          } 

        }
      } 

      Message message = myHandler.obtainMessage();
      message.what = MainActivity.HANDLE_MESSAGE_KEY;
      myHandler.sendMessage(message);
    }
  } 

  private boolean isSystemApplication(ApplicationInfo applicationInfo) {
    boolean isSystemApp = false;
    if (applicationInfo != null) {
      if ((applicationInfo.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0
          || (applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
        isSystemApp = true; 

      }
    }
    return isSystemApp;
  } 

  private boolean isClockApplication(String packageName) {
    boolean isClockApp = false;
    if (packageName != null && packageName.contains("clock") && !packageName.contains("widget")) {
      isClockApp = true;
    }
    return isClockApp;
  } 

  private void startSystemClock() {
    if (clockPackageInfos == null || clockPackageInfos.size() == 0) {
      Toast.makeText(getApplicationContext(), "--启动系统闹钟失败1--", Toast.LENGTH_SHORT).show();
      return;
    } 

    Log.d("CXC", "---clock package size :" + clockPackageInfos.size());
    Log.d("CXC", "---clock package [0] :" + clockPackageInfos.get(0).packageName);
    try {
      Intent startSysClockIntent = getPackageManager().getLaunchIntentForPackage(clockPackageInfos.get(0).packageName);
      startActivity(startSysClockIntent);
    } catch (Exception e) {
      Toast.makeText(getApplicationContext(), "--启动系统闹钟失败2--", Toast.LENGTH_SHORT).show();
    } 

  } 

} 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。

您可能感兴趣的文章:

• Android手机闹钟服务AlarmManagerk开发案例
• 简单实现Android闹钟程序 附源码
• Android闹钟设置的解决方案
• Android编程闹钟设置方法详解
• Android自定义View 实现闹钟唤起播放闹钟铃声功能
• 简单实现Android闹钟功能
• Android闹钟机制实现定时任务功能
• Android仿正点闹钟时间齿轮滑动效果
• Android使用CountDownTimer类实现倒计时闹钟
• android用闹钟定时做http请求推送的解决方案