1. 自定义实现带图标的TextView
IconTextView.java
package com.evor.andtest; import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.widget.TextView; public class IconTextView extends TextView {
// 命名空间的值
private final String namespace = "http://net.blogjava.mobile";
// 保存图像资源ID的变量
private int resourceId = 0;
private Bitmap bitmap; public IconTextView(Context context, AttributeSet attrs) {
super(context, attrs);
// getAttributeResourceValue方法用来获得组件属性的值，在本例中需要通过该方法的第1个参数指
// 定命名空间的值。该方法的第2个参数表示组件属性名（不包括命名空间名称），第3个参数表示默
// 认值，也就是如果该属性不存在，则返回第3个参数指定的值
resourceId = attrs.getAttributeResourceValue(namespace, "iconSrc", 0);
if (resourceId > 0)
// 如果成功获得图像资源的ID，装载这个图像资源，并创建Bitmap对象
bitmap = BitmapFactory.decodeResource(getResources(), resourceId);
} @Override
protected void onDraw(Canvas canvas) {
if (bitmap != null) {
// 从原图上截取图像的区域，在本例中为整个图像
Rect src = new Rect();
// 将截取的图像复制到bitmap上的目标区域，在本例中与复制区域相同
Rect target = new Rect();
src.left = 0;
src.top = 0;
src.right = bitmap.getWidth();
src.bottom = bitmap.getHeight();
int textHeight = (int) getTextSize();
target.left = 0;
// 计算图像复制到目标区域的纵坐标。由于TextView组件的文本内容并不是
// 从最顶端开始绘制的，因此，需要重新计算绘制图像的纵坐标
target.top = (int) ((getMeasuredHeight() - getTextSize()) / 2) + 1;
target.bottom = target.top + textHeight;
// 为了保证图像不变形，需要根据图像高度重新计算图像的宽度
target.right = (int) (textHeight * (bitmap.getWidth() / (float) bitmap
.getHeight()));
// 开始绘制图像
canvas.drawBitmap(bitmap, src, target, getPaint());
// 将TextView中的文本向右移动一定的距离（在本例中移动了图像宽度加2个象素点的位置）
canvas.translate(target.right + 2, 0);
}
super.onDraw(canvas);
}
}
MainActivity.java （另外还实现了获取系统当前时间的功能）
package com.evor.andtest; import java.text.SimpleDateFormat;
import java.util.Date; import android.app.AlertDialog;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button; public class MainActivity extends ActionBarActivity implements OnClickListener{ @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); Button btnShowDate = (Button)findViewById(R.id.btnShowDate);
Button btnShowTime = (Button)findViewById(R.id.btnShowTime);
btnShowDate.setOnClickListener(this);
btnShowTime.setOnClickListener(this);
} private void showDialog(String title,String msg){
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(title);
builder.setMessage(msg);
builder.setPositiveButton("确定", null);
builder.create().show();
} public void onClick(View v){
switch(v.getId()){
case R.id.btnShowDate:{
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
showDialog("当前日期",sdf.format(new Date()));
break;
}
case R.id.btnShowTime:{
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
showDialog("当前时间",sdf.format(new Date()));
break;
} }
} }
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:mobile="http://net.blogjava.mobile"
xmlns:tools="http://schemas.android.com/tools"
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"
android:orientation="vertical"
tools:context="com.evor.andtest.MainActivity" > <Button
android:id="@+id/btnShowDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="显示当前日期"
/> <Button
android:id="@+id/btnShowTime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="显示当前时间"
/> <com.evor.andtest.IconTextView
android:id ="@+id/txtFace1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="测试TextView"
mobile:iconSrc="@drawable/ic_launcher"
/> <com.evor.andtest.IconTextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="测试TextView"
android:textSize="24dp"
mobile:iconSrc="@drawable/ic_launcher"
/> </LinearLayout>
实现效果：
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2.含有3个按钮的AlertDialog
MainActivity.java
package com.evor.test; import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button; import com.example.andtest002alertdialog.R; public class MainActivity extends ActionBarActivity implements OnClickListener{ @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn = (Button)findViewById(R.id.btn1);
btn.setOnClickListener(this);
} @Override
public void onClick(View v) {
Builder builder = new AlertDialog.Builder(this);
builder.setTitle("是否覆盖文件");
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//单击确定按钮后，显示一个无按钮的对话框-
new AlertDialog.Builder(MainActivity.this).setMessage("文件已被覆盖").create().show();
}
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// 单击取消按钮后，显示一个无按钮的对话框
new AlertDialog.Builder(MainActivity.this).setMessage("取消了操作").create().show(); }
});
builder.setNeutralButton("忽略", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//单击取消按钮后，显示一个无按钮的对话框
new AlertDialog.Builder(MainActivity.this).setMessage("忽略覆盖操作").create().show(); }
}).show(); // //以上代码这样写也可以
// new AlertDialog.Builder(this)
// .setTitle("是否覆盖文件")
// .setPositiveButton("确定", new DialogInterface.OnClickListener() {
// @Override
// public void onClick(DialogInterface dialog, int which) {
// //单击确定按钮后，显示一个无按钮的对话框-
// new AlertDialog.Builder(MainActivity.this).setMessage("文件已被覆盖").create().show();
// }
// })
// .setNegativeButton("取消", new DialogInterface.OnClickListener() {
// @Override
// public void onClick(DialogInterface dialog, int which) {
// // 单击取消按钮后，显示一个无按钮的对话框
// new AlertDialog.Builder(MainActivity.this).setMessage("取消了操作").create().show();
//
// }
// })
// .setNeutralButton("忽略", new DialogInterface.OnClickListener() {
// @Override
// public void onClick(DialogInterface dialog, int which) {
// //单击取消按钮后，显示一个无按钮的对话框
// new AlertDialog.Builder(MainActivity.this).setMessage("忽略覆盖操作").create().show();
//
// }
// }).show(); }
}
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
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"
android:orientation="vertical"
tools:context="com.evor.test.MainActivity" > <Button
android:id="@+id/btn1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="确认/取消对话框"
/> </LinearLayout>
实现效果：
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3.用AlertDialog实现单选框、多选框
MainActivity.java
package com.evor.test; import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListView; public class MainActivity extends ActionBarActivity implements OnClickListener{ //列表对话框的字符串数组数据源
private String[] provinces = new String[]{
"辽宁省","山东省","河北省","福建省","广东省","黑龙江省"
};
//单击事件类的对象实例
private ButtonOnClick buttonOnClick = new ButtonOnClick(1); //用于保存多选列表对话框中的ListView对象
private ListView listView = null; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn1 = (Button)findViewById(R.id.btn1);
Button btn2 = (Button)findViewById(R.id.btn2);
Button btn3 = (Button)findViewById(R.id.btn3);
btn1.setOnClickListener(this);
btn2.setOnClickListener(this);
btn3.setOnClickListener(this);
} //显示简单列表对话框
private void showListDialog(){
new AlertDialog.Builder(this).setTitle("选择省份")
.setItems(provinces,new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
final AlertDialog ad = new AlertDialog.Builder(MainActivity.this)
.setMessage("您已经选择了:"+which+":"+provinces[which]).show();
Handler handler = new Handler();
//设置定时器，5S后调用run方法,使对话框自动消失
handler.postDelayed(new Runnable(){
@Override
public void run() {
ad.dismiss();
}
}, 5000);
}
}).show();
} //显示单选列表对话框
private void showSingleChoiceDialog(){
new AlertDialog.Builder(this).setTitle("选择省份")
.setSingleChoiceItems(provinces, 1, buttonOnClick)
.setPositiveButton("确定",buttonOnClick)
.setNegativeButton("取消", buttonOnClick).show();
} //显示多选列表对话框(演示了另一种创建对话框的方法)
private void showMultiChoseDialog(){
Builder builder = new AlertDialog.Builder(this);
builder.setTitle("选择省份");
//设置选项
builder.setMultiChoiceItems(provinces, new boolean[]{false,false,false,false,false,false},
new DialogInterface.OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
}
});
//设置确定按钮
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//int count = listView.getCount();
String s = "您选择了：";
for(int i = 0 ;i < provinces.length ; i++){
if(listView.getCheckedItemPositions().get(i)==true)
s= s + i+":"+listView.getAdapter().getItem(i);
}
if(listView.getCheckedItemPositions().size()>0){
new AlertDialog.Builder(MainActivity.this).setMessage(s).show();
}else{
new AlertDialog.Builder(MainActivity.this).setMessage("未选择任何省份").show();
}
}
});
//设置取消按钮
builder.setNegativeButton("取消", null);
//创建对话框
AlertDialog ad = builder.create();
listView = ad.getListView();
ad.show();
} //确定对话框内选择的是什么
private class ButtonOnClick implements DialogInterface.OnClickListener{
private int index; //表示省份数组的索引
public ButtonOnClick(int index){
this.index = index;
}
@Override
public void onClick(DialogInterface dialog, int which) {
//which表示单击的按钮索引，所有列表项的索引都是大于等于0的，按钮的索引是小于0的
if(which >=0){
index = which; //如果单击的是列表项，保存列表项索引到index
//如果想单击之后关闭对话框，可调用dialog.cancel()或者dialog.dismiss()
}else{
if(which == DialogInterface.BUTTON_POSITIVE){ //单击确定按钮
new AlertDialog.Builder(MainActivity.this)
.setMessage("选择了"+index+":"+provinces[index]).show();
}
}
}
}//END CLASS //响应按钮动作
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.btn1:{
showListDialog();
break;
}
case R.id.btn2:{
showSingleChoiceDialog();
break;
}
case R.id.btn3:{
showMultiChoseDialog();
break;
}
}
} }
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
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"
android:orientation="vertical"
tools:context="com.evor.test.MainActivity" > <Button
android:id="@+id/btn1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="显示列表对话框"
/> <Button
android:id="@+id/btn2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="显示单选列表对话框"
/>
<Button
android:id="@+id/btn3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="显示多选列表对话框"
/> </LinearLayout>
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4.用AlertDialog实现含编辑框的对话框
MainActivity.java
package com.evor.test; import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TableLayout; public class MainActivity extends ActionBarActivity { @Override
protected void onCreate(Bundle savedInstanceState) {
final Builder builder = new AlertDialog.Builder(this);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn1 = (Button)findViewById(R.id.btn1); btn1.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
builder.setTitle("含编辑框的对话框");
TableLayout loginForm = (TableLayout)getLayoutInflater().inflate(R.layout.login, null);
builder.setView(loginForm); //设置对话框显示的view对象
builder.setPositiveButton("登录",
new DialogInterface.OnClickListener(){ //注意，要加前面的DialogInterface，否则会混淆
@Override
public void onClick(DialogInterface dialog,int which) {
//执行登录处理
}
});
builder.setNegativeButton("取消",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// 取消登录
}
});
builder.create().show();
};
});
}//END onCreate
}
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
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"
android:orientation="vertical"
tools:context="com.evor.test.MainActivity" > <Button
android:id="@+id/btn1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="输入信息"
/> </LinearLayout>
login.xml
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/loginForm"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" > <TableRow>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="用户名"
android:textSize="10pt"
/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请填写登录账号"
android:selectAllOnFocus="true"
/>
</TableRow> <TableRow>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="密码"
android:textSize="10pt"
/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:password="true"
/>
</TableRow> <TableRow>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="电话"
android:textSize="10pt"
/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请输入电话号码"
/>
</TableRow> <Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="注册"
/>
</TableLayout>
实现效果：
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5.AlertDialog作为Activity的主题
MainActivity.java
package com.evor.test; import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale; import android.app.Activity;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.DialogInterface.OnDismissListener;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button; public class MainActivity extends Activity { private DateDialog dateDialog; @Override
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnCurrentDate = (Button) findViewById(R.id.btn1);
Button btnFinish = (Button) findViewById(R.id.btn2);
MyOnClickListener mylistener = new MyOnClickListener();
btnCurrentDate.setOnClickListener(mylistener);
btnFinish.setOnClickListener(mylistener);
dateDialog = new DateDialog(this); }// END onCreate class MyOnClickListener implements View.OnClickListener { @Override
public void onClick(View v) {
switch(v.getId()){
case R.id.btn1:{
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd",Locale.getDefault());
dateDialog.setTitle("当前日期："+sdf.format(new Date()));
dateDialog.setButton("确定", new OnClickListener(){
@Override
public void onClick(DialogInterface dialog, int which) { }
});
dateDialog.setOnDismissListener(new OnDismissListener(){
@Override
public void onDismiss(DialogInterface dialog) {
new DateDialog.Builder(MainActivity.this).create().show();
}
});
dateDialog.show();
break;
}
case R.id.btn2:
finish();
break;
}
}//END onClick
}//END inner class @Override
public boolean onTouchEvent(MotionEvent event){
finish();
return true;
}
}
DateDialog.java
package com.evor.test; import android.app.AlertDialog;
import android.content.Context;
import android.view.MotionEvent; public class DateDialog extends AlertDialog{
public DateDialog(Context context){
super(context);
} //触摸屏幕任何地方都会出发该事件
@Override
public boolean onTouchEvent(MotionEvent event){
dismiss(); //关闭对话框
return super.onTouchEvent(event);
} }
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
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"
android:orientation="horizontal"
tools:context="com.evor.test.MainActivity" > <Button
android:id="@+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="当前日期"
/>
<Button
android:id="@+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="关闭"
/> </LinearLayout>
AndroidManifest.xml中需要修改的地方
<activity
android:name="com.evor.test.MainActivity"
android:label="@string/app_name"
android:theme="@android:style/Theme.Dialog"> <!-- 设置主题为对话框形式 -->
。。。。。省略
</activity>
上面加了一行 android:theme="@android:style/Theme.Dialog"
实现效果：
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