Android gets the phone model and system version number and App version number and other information for example explanation

MainActivity is as follows:

 
package cn.testgethandsetinfo; 
import android.os.Bundle; 
import android.text.TextUtils; 
import android.widget.TextView; 
import android.app.Activity; 
import android.content.Context; 
import android.content.pm.PackageInfo; 
import android.content.pm.PackageManager; 
/** 
* Demo describe : 
*  Get the phone model , System version ,App Version number and other information  
*/ 
public class MainActivity extends Activity { 
private TextView mTextView; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.main); 
init(); 
} 
private void init(){ 
mTextView=(TextView) findViewById(R.id.textView); 
mTextView.setText(getHandSetInfo()); 
} 
private String getHandSetInfo(){ 
String handSetInfo= 
" Mobile phone models :" + android.os.Build.MODEL + 
",SDK version :" + android.os.Build.VERSION.SDK + 
", System version :" + android.os.Build.VERSION.RELEASE+ 
", Software version :"+getAppVersionName(MainActivity.this); 
return handSetInfo; 
} 
// Gets the current version number  
private String getAppVersionName(Context context) { 
String versionName = ""; 
try { 
PackageManager packageManager = context.getPackageManager(); 
PackageInfo packageInfo = packageManager.getPackageInfo("cn.testgethandsetinfo", 0); 
versionName = packageInfo.versionName; 
if (TextUtils.isEmpty(versionName)) { 
return ""; 
} 
} catch (Exception e) { 
e.printStackTrace(); 
} 
return versionName; 
} 
} 

main. xml as follows:

 
<RelativeLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
> 
<TextView 
android:id="@+id/textView" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:text="@string/hello_world" 
android:layout_centerInParent="true" 
/> 
</RelativeLayout>