[Android实例] 判断手机是否已安装某程序的小示例

public boolean isApkAvailable(String packagename) { 
  PackageInfo packageInfo;

        try { 
            packageInfo = this.getPackageManager().getPackageInfo( 
                    packagename, 0); 

        } catch (NameNotFoundException e) { 
            packageInfo = null; 
        } 
        if(packageInfo ==null){ 
            return false;
        }else{ 
         return true;
        }
    } 

 

if(isApkAvailable("包名")){ 
    Intent intent = new Intent(); 
                intent = getPackageManager().getLaunchIntentForPackage("包名"); 
                startActivity(intent);
   }else{//未安装，跳转至market下载该程序 
    Uri uri = Uri.parse("market://details?id=包名");
                Intent it = new Intent(Intent.ACTION_VIEW, uri); 
                startActivity(it); 
   }

 

if(isAvilible( "包名")){ 
Intent i = new Intent(); 
ComponentName cn = new ComponentName("包名", "包名.Activity"); 
i.setComponent(cn); 
startActivityForResult(i, RESULT_OK); 
} 
//未安装，跳转至market下载该程序 
else { 
Uri uri = Uri.parse("market://details?id=包名");//id为包名 
Intent it = new Intent(Intent.ACTION_VIEW, uri); 
startActivity(it); 
} 

 

Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse("market://details?id=" + getPackageName()));