[Android范例] 判断手机是否已安装某程序的小示例

[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; } }

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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);    }

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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); } 

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

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