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一、通過包名開啟APP

（1）、第一步：

doStartApplicationWithPackageName("com.grasp.nsuperseller");

/*開啟app*/
@TargetApi(Build.VERSION_CODES.DONUT)
private void doStartApplicationWithPackageName(String packagename) {

    // 
 
通過包名獲取此APP詳細資訊，包括Activities、services、versioncode、name等等
PackageInfo packageinfo = null;
    try {
        packageinfo = getPackageManager().getPackageInfo(packagename, 0);
    } catch (PackageManager.NameNotFoundException e) {
        e.printStackTrace();
    }
    if (packageinfo == null) {
        return
 
;
    }

    // 建立一個類別為CATEGORY_LAUNCHER的該包名的Intent
Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);
    resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);
    resolveIntent.setPackage(packageinfo.packageName);

    // 通過getPackageManager()的queryIntentActivities方法遍歷
List<ResolveInfo> resolveinfoList = getPackageManager()
            .queryIntentActivities(resolveIntent, 0
 
);

    ResolveInfo resolveinfo = resolveinfoList.iterator().next();
    if (resolveinfo != null) {
        // packagename = 引數packname
String packageName = resolveinfo.activityInfo.packageName;
        // 這個就是我們要找的該APP的LAUNCHER的Activity[組織形式：packagename.mainActivityname]
String className = resolveinfo.activityInfo.name;
        // LAUNCHER Intent
Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);

        // 設定ComponentName引數1:packagename引數2:MainActivity路徑
ComponentName cn = new ComponentName(packageName, className);

        intent.setComponent(cn);
        startActivity(intent);
    }
}

例如：開啟    NSignInHallActivity

Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
ComponentName cn = new ComponentName("com.grasp.nsuperseller", "com.grasp.nsuperseller.activity.signin.NSignInHallActivity");
intent.setComponent(cn);
startActivity(intent);

（1）、第一步：

getAppSatus(ClockAlarmActivity.this, "com.grasp.nsuperseller

/**
 * 返回app執行狀態
* 1:程式在前臺執行
* 2:程式在後臺執行
* 3:程式未啟動
* 注意：需要配置許可權<uses-permission android:name="android.permission.GET_TASKS" /> */
public int getAppSatus(Context context, String pageName) {

    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<ActivityManager.RunningTaskInfo> list = am.getRunningTasks(20);

    //判斷程式是否在棧頂
if (list.get(0).topActivity.getPackageName().equals(pageName)) {
        return 1;
    } else {
        //判斷程式是否在棧裡
for (ActivityManager.RunningTaskInfo info : list) {
            if (info.topActivity.getPackageName().equals(pageName)) {
                return 2;
            }
        }
        return 3;//棧裡找不到，返回3
}
}