机器人：如何更改按钮单击布局？ [英] android: how to change layout on button click?

问题描述

我要下$ C $下按钮点击选择布局。

  View.OnClickListener处理器=新View.OnClickListener（）{
    公共无效的onClick（视图v）{

        开关（v.getId（））{

            案例R.id.DownloadView：
                // doStuff
                的setContentView（R.layout.main）;
                打破;
            案例R.id.AppView：
                // doStuff
                的setContentView（R.layout.app）;
                打破;
        }
    }
};

findViewById（R.id.DownloadView）.setOnClickListener（处理）;
findViewById（R.id.AppView）.setOnClickListener（处理）;
 

当我点击AppView按钮，布局的变化，但是当我点击DownloadView按钮，没有任何反应。

此链接说，我要开始新的活动。

但我不知道如何使用意向的code在那里开始新的活动，将一个新的文件被添加？

编辑： 我有我的code。在新的活动：

 包com.example.engagiasync;

进口android.app.Activity;
进口android.content.Intent;
进口android.os.Bundle;
进口android.view.View;
进口android.view.View.OnClickListener;
进口android.widget.TextView;

公共类AppView扩展活动实现OnClickListener {


    @覆盖
    公共无效的onCreate（包savedInstanceState）{

        的setContentView（R.layout.app）;

        TextView的电视=（TextView中）this.findViewById（R.id.thetext）;
        tv.setText（应用程序查看哟\ N！？）;
    }

    @覆盖
    公共无效的onClick（视图v）{
        // TODO自动生成方法存根

    }
}
 

，但它不工作，它强制关闭时，logcat中说：

解决方案

 按钮btnDownload =（按钮）findViewById（R.id.DownloadView）;
  按钮btnApp =（按钮）findViewById（R.id.AppView）;

  btnDownload.setOnClickListener（处理）;
  btnApp.setOnClickListener（处理）;

  View.OnClickListener处理器=新View.OnClickListener（）{

  公共无效的onClick（视图v）{

    如果（V == btnDownload）{
            // doStuff
            意图int​​entMain =新的意图（CurrentActivity.this，
                                           SecondActivity.class）;
            CurrentActivity.this.startActivity（intentMain）;
            Log.i（内容，主布局）;
    }

    如果（V == btnApp）{
            // doStuff
            意图int​​entApp =新的意图（CurrentActivity.this，
                                          ThirdActivity.class）;

            CurrentActivity.this.startActivity（intentApp）;

            Log.i（内容，应用程序布局）;

    }
   }
  };
 

注：然后你应该声明在这样的清单你所有的活动：

 ＆LT;活动机器人：名称=SecondActivity＆GT;＆LT; /活性GT;
＆LT;活动机器人：名称=ThirdActivity＆GT;＆LT; /活性GT;
 

编辑：更新这部分的code :)：的

  @覆盖
公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）; //加入这一行

    的setContentView（R.layout.app）;

    TextView的电视=（TextView中）this.findViewById（R.id.thetext）;
    tv.setText（应用程序查看哟\ N！？）;
}
 

注：检查此的教程关于如何切换之间的活动。

I have to following code for selecting layout on button click.

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);

When I click the "AppView" button, the layout changes, but when I click the "DownloadView "button, nothing happens.

This link says that I have to start a new activity.

But I don't know how to use the code there of intent to start new activity, will a new file be added?

EDIT: I have my code on the new activity:

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

    }
}

but it does not work, it force closes, the logcat says:

解决方案

  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 ");

    }
   }
  };

Note : and then you should declare all your activities in the manifest like this :

<activity android:name="SecondActivity" ></activity>
<activity android:name="ThirdActivity" ></activity>

EDIT : update this part of Code :) :

@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");
}

NB : check this Tutorial About How To Switch Between Activities.

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