Call the android sub-function

Call the android sub-function
Create an Android project.

1 Layout
Open main. xml and modify the content as follows:

<TextView  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:text="@string/mobile"/>  <EditText   android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:inputType="text"  android:id="@+id/mobile"  /><Button   android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="@string/button"  android:id="@+id/button"  />

Binary definition string
Open strings. xml and add the following content:

<String name = "mobile"> enter the mobile phone number </string> <string name = "button"> dialing </string>

3. Response to click events
1. method 1 (recommended)
Open MainActivity. java and add the following code to the onCreate function:

public void onCreate(Bundle savedInstanceState){  super.onCreate(savedInstanceState);setContentView(R.layout.main);Button button = (Button) this.findViewById(R.id.button);button.setOnClickListener(new ButtonClick());}

Define an internal class to implement the callback object:

private final class ButtonClick implements View.OnClickListener{public void onClick(View v){EditText text = (EditText) findViewById(R.id.mobile);String num = text.getText().toString();Intent intent = new Intent();intent.setAction("android.intent.action.CALL");intent.setData(Uri.parse("tel:"+num));startActivity(intent);}}

Internal classes reduce file loading and speed up Virtual Machine Software loading.


2 method 2

public void onCreate(Bundle savedInstanceState){  super.onCreate(savedInstanceState);setContentView(R.layout.main);Button button = (Button) this.findViewById(R.button);button.setOnClickListener(new View.OnClickListener(){public void onClick(View v){EditText text = (EditText) findViewById(R.id.mobile);String num = text.getText().toString();Intent intent = new Intent();intent.setAction("android.intent.action.CALL");intent.setData(Uri.parse("tel:"+num));startActivity(intent);}});}

4. Add Permissions
Add permissions to Manifest. xml:

<uses-permission android:name="android.permission.CALL_PHONE"/> 

5. Optimization
Each time you click a button, onClick is executed and the code is executed:

EditText text = (EditText) findViewById(R.id.mobile);

To search for controls and find resources, so we can put this sentence in onCreate and only execute it once.