package com.example.homework4;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.RelativeLayout;
public class MainActivity extends ActionBarActivity {
public int i = 0, r = 0, g = 0, b = 0;
public int[] arr = { Color.rgb(0, 0, 255), Color.rgb(255, 0, 0),
Color.rgb(255, 255, 255), Color.rgb(0, 0, 0), Color.rgb(0, 255, 0) };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void click(View v) {
AlertDialog dialog;
AlertDialog.Builder builder = new AlertDialog.Builder(this)
.setTitle("设置字体大小")
// 设置标题
.setIcon(R.drawable.ic_launcher)
.setSingleChoiceItems(
new String[] { "蓝色", "红色", "白色", "黑色", "绿色" }, 0,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
// 点单选按钮时发生的事件,这里which表示你点的单选按钮是第几个
i = which;
}
})
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// 点确定按钮时发生的事件
RelativeLayout rl = (RelativeLayout) findViewById(R.id.qqq);
rl.setBackgroundColor(arr[i]);
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
dialog = builder.create();
dialog.show();
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/qqq"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.homework4.MainActivity" >
<Button
android:id="@+id/but1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="188dp"
android:onClick="click"
android:text="设置背景颜色" />
</RelativeLayout>