android手机编程3.2.3 3.2.4
把activity_main.xml修改为：<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:id="@+id/text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="This is TextView"
android:gravity="center"
android:textSize="24sp"
android:textColor="#00ff00"
android:textStyle="bold"
/>
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="#00ff00"
android:layout_marginTop="50dp"
android:text="button"
/>
<EditText
android:id="@+id/edit_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Type something here"
android:maxLines="2"
/>
<ImageView
android:id="@+id/img_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/a"/>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="#00f0f0"
android:layout_marginTop="10dp"
android:text="button1"
/>
</LinearLayout>
先把两张准备好的图片复制到drawable目录下，如图：
把mainactivity.java文件修改为：
package com.example.xinwei.viewcontroller;
import android.content.DialogInterface;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private TextView myText;
private EditText editText;
private ImageView imageView;
private Button button1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = (Button)findViewById(R.id.button);
myText=(TextView)findViewById(R.id.text);
button.setOnClickListener(this);
editText = (EditText)findViewById(R.id.edit_text);
editText.setOnClickListener(this);
imageView = (ImageView)findViewById(R.id.img_view);
button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch(view.getId()){
case R.id.button:
myText.setTextColor(Color.parseColor("red"));
break;
case R.id.edit_text:
String inputText=editText.getText().toString().trim();
Toast.makeText(this, inputText, Toast.LENGTH_SHORT).show();
break;
case R.id.button1:
imageView.setImageResource(R.drawable.logo);
break;
}
}
}
文本编辑和图片显示这两个控件都是经常用的，都hen简单没什么可讲的，效果图图下：
页:
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