The full name is Dalvik Debug Monitor Service
Dalvik virtual machine debugging monitoring service in the Android development environment
Debugging tools for Android application development provided in Eclipse
Four important views of DDMS:
Logcat: View log output
File Explorer: View internal system files
Decices: Displays associated Android devices
Emulator Control: Action controls the associated Android device
Note: Open four views in Eclipse for easy debugging
Logcat window
File Explorer window
Devices window
Emulator Control window
Compare Log with System.out:
Related ApIs:
//Main interface Activity
public class MainActivity extends Activity{
private Button btn_main_download; // View generation member variables in the layout
protected void onCreate(Bundle savedInstanceState) {
//Load the layout and generate the corresponding attempt object
//Call the onCreate method of the parent class
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//1. Get Button object
btn_main_download=(Button) findViewById(R.id.btn_main_download);
//2. Set click listener for button
btn_main_download.setOnClickListener(new View.OnClickListener() {
//In the callback method:
public void onClick(View v){//Called when the user clicks the button
//1. A text prompt to start downloading
//1. Context can pass Application or Activity object 2 Display text 3. Time toast LONG SHORT
Toast.makeText(MainActivity.this, "Start downloading...",Toast.LENGTH_SHORT).show();
//2. Update Button display text
btn_main_download.setText("Downloading...");
}}）；
//Test Log
Log.i("TAG", "i() print information");//General information log
Log.e("MainActivity", "e() print information");//Error log
measurement unit:
Comparison of size units:
dp vs px comparison?
Length in px, which gets bigger on bad phones and smaller on good phones
In dp, it will not change
About the colors:
