Android(安卓)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
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 allPackageInfos;//系统安装所有软件    private List 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();    }    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 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();        }    }}
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