Summary of Button event implementation and listening methods developed by Android
- 2020-12-09 01:02:24
- OfStack
This paper summarizes the Button event implementation and listening methods developed by Android. To share for your reference, the details are as follows:
Let's start with two approaches to implementing Button events
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Button
android:id="@+id/myButton1"
android:text=" button 1 "
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<Button
android:id="@+id/myButton2"
android:text=" button 2 "
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>
strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, ButtonDemoActivity!</string>
<string name="app_name">ButtonDemo</string>
</resources>
1 species:
ButtonDemoActivity. java:
package com.android.ButtonDemo.activity;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class ButtonDemoActivity extends Activity {
Button myButton1,myButton2;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myButton1=(Button)findViewById(R.id.myButton1);
myButton2=(Button)findViewById(R.id.myButton2);
// Use anonymous class registration Button The event
myButton1.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
Toast.makeText(ButtonDemoActivity.this, " You click the button 1",Toast.LENGTH_LONG).show();
}
});
myButton2.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
Toast.makeText(ButtonDemoActivity.this, " You click the button 2",Toast.LENGTH_LONG).show();
}
});
}
}
The second:
ButtonDemoActivity. java:
package com.android.ButtonDemo.activity;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class ButtonDemoActivity extends Activity {
Button myButton1,myButton2;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myButton1=(Button)findViewById(R.id.myButton1);
myButton2=(Button)findViewById(R.id.myButton2);
myButton1.setOnClickListener(new ButtonClick());
myButton2.setOnClickListener(new ButtonClick());
}
// create 1 Class to respond OnClickListener
class ButtonClick implements OnClickListener
{
public void onClick(View v)
{
switch (v.getId()) {
case R.id.myButton1:
Toast.makeText(ButtonDemoActivity.this, " You click the button 1",Toast.LENGTH_LONG).show();
break;
case R.id.myButton2:
Toast.makeText(ButtonDemoActivity.this, " You click the button 2",Toast.LENGTH_LONG).show();
break;
default:
break;
}
}
}
}
Let's talk about the Button listening method
At present, android button controls mainly have the following listening methods:
1 button control corresponds to 1 listener:
Button buttontest;
buttontest = (Button) findViewById(R.id.button1);
buttontest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Log.i("TEST", "button onClick");
}
});
Multiple button correspond to one monitor 1:
start = (Button) findViewById(R.id.button1);
stop = (Button) findViewById(R.id.button2);
start.setOnClickListener(mylistener );
stop.setOnClickListener(mylistener );
View.OnClickListener mylistener = new View.OnClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button1:
Log.d(TAG, "Start to recorder video\n");
start_recorde();
break;
case R.id.button2:
Log.d(TAG, "Stop to recorder video\n");
stop_recorde();
break;
default:
break;
}
}
};
Multiple button correspond to one monitor 2:
public class MainActivity extends Activity implements View.OnClickListener{
// Interface elements
private Button start;
private Button stop;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
start = (Button) findViewById(R.id.button1);
stop = (Button) findViewById(R.id.button2);
start.setOnClickListener(this);
stop.setOnClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button1:
Log.d(TAG, "Start to recorder video\n");
break;
case R.id.button2:
Log.d(TAG, "Stop to recorder video\n");
break;
default:
break;
}
}
}
Binding listening in xml:
<Button
android:id="@+id/button1"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:onClick="mybuttonlistener">
</Button>
The corresponding java code is as follows:
Button btn = (Button) findViewById(R.id.button1);
public void mybuttonlistener(View target){
//do something5
}
Personally, the fourth implementation is not recommended.
I hope this article has been helpful for Android programming.