问题
I have 3 activities. Main activity which is the home screen with two buttons, each button should show up one of the 2 last activity. I tried many methods for multiple buttons both in intent mode and switch mode; but I still can have two working button. The first button starts its linked activity without any problem, but the second button still won't show up. Here is the java code:
package com.live.app;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;
public class MainActivity extends Activity {
Button button;
Button button01;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
addListenerOnButton();
}
public void addListenerOnButton() {
final Context context = this;
button = (Button) findViewById(R.id.buttonUrl);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Intent intent = new Intent(context, WoneWideo.class);
startActivity(intent);
}
});
}
public void addListenerOnButton2() {
final Context context = this;
button01 = (Button) findViewById(R.id.button01);
button01.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Intent intent = new Intent(context, WebViewActivity.class);
startActivity(intent);
}
});
}
}
The main layout file content:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
..........................
..............................
<Button
android:id="@+id/buttonUrl"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/live_button"
android:onClick="onClick"/>
<Button
android:id="@+id/button01"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/vod_button"
android:onClick="onClick"/>
</LinearLayout>
Also I have all these activities/class declared in the Manifest file.
回答1:
You forget to call addListenerOnButton2(). Anyhow You can make your code simple
Try This:
Button btn1,btn2;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn1 = (Button)findViewById(R.id.buttonUrl);
btn2 = (Button)findViewById(R.id.button01);
}
public void onClick(View v){
if(v.getId() == R.id.buttonUrl){
Intent intent = new Intent(context, WoneWideo.class);
startActivity(intent);
}else if(v.getId() == R.id.button01){
Intent intent = new Intent(context, WebViewActivity.class);
startActivity(intent);
}
}
回答2:
When there is a property android:onClick="onClick" in your xml, then there is no need for setting listeners. Only thing you need is, a function with signature public void onClick(View v){}
So, the Activity will be as:
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void onClick(View v){
switch(v.getId()){
case R.id.buttonUrl:
Intent intent = new Intent(context, WoneWideo.class);
startActivity(intent);
break;
case R.id.button01:
Intent intent = new Intent(context, WebViewActivity.class);
startActivity(intent);
break;
}
}
回答3:
You did not call addListenerOnButton2() in onCreate(). You only called addListenerOnButton()
来源：https://stackoverflow.com/questions/20382521/using-multiple-button-to-start-different-activities-android