我必须遵循代码来选择按钮单击时的布局。
View.OnClickListener handler = new View.OnClickListener(){
public void onClick(View v) {
switch (v.getId()) {
case R.id.DownloadView:
// doStuff
setContentView(R.layout.main);
break;
case R.id.AppView:
// doStuff
setContentView(R.layout.app);
break;
}
}
};
findViewById(R.id.DownloadView).setOnClickListener(handler);
findViewById(R.id.AppView).setOnClickListener(handler);
当我点击“AppView”按钮时,布局发生变化,但当我点击“DownloadView”按钮时,什么也没有发生。
This link说我必须开始一项新 Activity 。
但是我不知道如何使用那里的代码来启动新的 Activity ,是否会添加一个新文件?
编辑: 我有关于新 Activity 的代码:
package com.example.engagiasync;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;
public class AppView extends Activity implements OnClickListener{
@Override
public void onCreate(Bundle savedInstanceState){
setContentView(R.layout.app);
TextView tv = (TextView) this.findViewById(R.id.thetext);
tv.setText("App View yo!?\n");
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}
但它不起作用,它强制关闭,logcat 说:
最佳答案
Button btnDownload = (Button) findViewById(R.id.DownloadView);
Button btnApp = (Button) findViewById(R.id.AppView);
btnDownload.setOnClickListener(handler);
btnApp.setOnClickListener(handler);
View.OnClickListener handler = new View.OnClickListener(){
public void onClick(View v) {
if(v==btnDownload){
// doStuff
Intent intentMain = new Intent(CurrentActivity.this ,
SecondActivity.class);
CurrentActivity.this.startActivity(intentMain);
Log.i("Content "," Main layout ");
}
if(v==btnApp){
// doStuff
Intent intentApp = new Intent(CurrentActivity.this,
ThirdActivity.class);
CurrentActivity.this.startActivity(intentApp);
Log.i("Content "," App layout ");
}
}
};
注意:然后您应该在 list .xml 文件中声明所有 Activity ,如下所示:
<activity android:name=".SecondActivity" ></activity>
<activity android:name=".ThirdActivity" ></activity>
编辑:更新这部分代码:):
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);// Add THIS LINE
setContentView(R.layout.app);
TextView tv = (TextView) this.findViewById(R.id.thetext);
tv.setText("App View yo!?\n");
}
注意:检查 (Broken link) Tutorial About How To Switch Between Activities .
关于java - android:如何更改按钮点击布局?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6121797/