Android系列之LinearLayout+EditText+Button+AlertDialog

这个简单的例子是EditText中默认有个字符串text，单击Show按钮，弹出AlertDialog显示EditText中的内容，单击Clear按钮，清除EditText中的内容！！



Activity用到两个LinearLayout,两个Button,一个TextView,一个EditText！

main.xml代码如下：

<?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"
/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/text"
android:id="@+id/text"
/>
<LinearLayout
android:id="@+id/linearlayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btnShow"
android:id="@+id/btnShow"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btnClear"
android:id="@+id/btnClear"
/>
</LinearLayout>
</LinearLayout>

java代码

import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class practice extends Activity {
Button btnShow;
Button btnClear;
EditText text;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

btnShow = (Button)findViewById(R.id.btnShow);
btnClear = (Button)findViewById(R.id.btnClear);
text = (EditText)findViewById(R.id.text);

btnShow.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new AlertDialog.Builder(practice.this)
.setTitle("Infomation")
.setIcon(android.R.drawable.ic_dialog_dialer)
.setMessage(text.getText())
.show();
}
});

btnClear.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
text.setText("");
}
});
}
}