Android在一個APP中通過包名或類名啓動另一個APP

調用apk方法一：知道包名類名

  /**
* @exception :啓動apk
* @param ：String  包名
* @param ：String  類名
* **/
public void startActivity(String packageName,String  className){

Intent intent = new Intent(Intent.ACTION_MAIN);  
intent.addCategory(Intent.CATEGORY_LAUNCHER);              
ComponentName cn = new ComponentName(packageName, className);              
intent.setComponent(cn);  
startActivity(intent);  

}

調用apk方法二：只知道知道包名

  /**
* @exception :啓動apk
* @param ：String  包名
* **/
public void startAPP(String appPackageName){  
       try{  
           Intent intent = this.getPackageManager().getLaunchIntentForPackage(appPackageName);  
           startActivity(intent);  
       }catch(Exception e){  
           Toast.makeText(this, "沒有安裝", Toast.LENGTH_LONG).show();  
       }  
   }  

同一個apk內部啓動另一個activity:

MainActivity:當前所在activity
SetActivity：要啓動的activity

Intent intent = new Intent(MainActivity.this,SetActivity.class);
startActivity(intent);

調用apk方法三：今天遇到個坑，如果app啓動類名不是MainActivity(現在沒時間找原因，總之方法二啓動不了了)可能上面的方法就不行了，那就試試下面這個方法吧
[java] view plain copy
/**
* 根據包名啓動app 主類名不是MainActivity的情況
* */

    public static void RunApp(String packageName,Context mContext) {     

        PackageInfo pi;    
        try {    
            pi = mContext.getPackageManager().getPackageInfo(packageName, 0);    
            Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);    
            resolveIntent.setPackage(pi.packageName);    
            PackageManager pManager = mContext.getPackageManager();    
            List apps = pManager.queryIntentActivities(    
                    resolveIntent, 0);    

            ResolveInfo ri = (ResolveInfo) apps.iterator().next();    
            if (ri != null) {    
                packageName = ri.activityInfo.packageName;    
                String className = ri.activityInfo.name;    
                Intent intent = new Intent(Intent.ACTION_MAIN);    
                ComponentName cn = new ComponentName(packageName, className);    
                intent.setComponent(cn);    
                mContext.startActivity(intent);    
            }    
        } catch (NameNotFoundException e) {    
            e.printStackTrace();    
        }    

    }