对话框就是一般的弹出窗口，主要用来提示用户，和用户交互。
创建Activity对话框
使用Activity模拟对话框。这个比较简单，主要是使用Activity自带的Dialog主题。
创建DialogActivity，并在AndroidManifest中注册。
改变DialogActivity的主题：
<activity
android:theme="@android:style/Theme.Dialog"
android:name="com.whathecode.usingdialog.DialogActivity"
android:label="@string/title_activity_dialog" >
</activity>
DialogActivity代码示例：
package com.whathecode.usingdialog;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
public class DialogActivity extends Activity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dialog);
}
//用来关闭这个Activity
public void close(View view)
{
finish();
}
}
DialogActivity布局文件：
<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:padding="5dp"
android:orientation="vertical"
android:gravity="center_vertical|center_horizontal"
tools:context=".DialogActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="这是基于Activity的Dialog" />
<LinearLayout
android:layout_marginTop="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/confirm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="确定"
android:onClick="close"/>
<Button
android:id="@+id/cancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="取消"
android:onClick="close"/>
</LinearLayout>
</LinearLayout>
MainActivity代码：
package com.whathecode.usingdialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.View;
public class MainActivity extends FragmentActivity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void openActivityDialog(View view)
{
Intent intent = new Intent(this, DialogActivity.class);
startActivity(intent);
}
}
运行效果：
创建单选,多选和带进度条的对话框:
主要是使用AlertDialog类，首先通过创建AlertDialog类的实例，然后使用showDialog显示对话框。
showDialog方法的执行会引发onCreateDialog方法被调用
示例代码：
package com.whathecode.usingdialog;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends Activity
{
private static final int SINGLE_CHOICE_DIALOG = 0;
private static final int MULTI_CHOICE_DIALOG = 1;
private static final int PROGRESS_DIALOG = 2;
protected static final int MAX_PROGRESS = 30;
private CharSequence items[] = new String[] { "apple", "google",
"microsoft" };
private boolean checkedItems[] = new boolean[3];
private Handler progressHandler;
private int progress;
protected ProgressDialog progressDialog;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
progressHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (progress >= MAX_PROGRESS) {
progressDialog.dismiss(); //关闭progressDialog
} else {
progress++;
//进度条加1
progressDialog.incrementProgressBy(1);
//只要当前进度小于总进度，每个100毫秒发送一次消息
progressHandler.sendEmptyMessageDelayed(0, 100);
}
}
};
}
public void openActivityDialog(View view)
{
Intent intent = new Intent(this, DialogActivity.class);
startActivity(intent);
}
//显示单选对话框
public void openSinglechoiceDialog(View view)
{
showDialog(SINGLE_CHOICE_DIALOG);
}
//显示多选对话框
public void openMultichoiceDialog(View view)
{
showDialog(MULTI_CHOICE_DIALOG);
}
//显示进度条对话框
public void openProgressDialog(View view)
{
showDialog(PROGRESS_DIALOG);
progress = 0;
progressDialog.setProgress(0);
progressHandler.sendEmptyMessage(0);
}
@Override
@Deprecated
protected Dialog onCreateDialog(int id)
{
switch (id)
{
case SINGLE_CHOICE_DIALOG:
return createSingleChoiceDialog();
case MULTI_CHOICE_DIALOG:
return createMultichoiceDialog();
case PROGRESS_DIALOG:
return createProgressDialog();
default:
break;
}
return null;
}
/**
* 创建单选对话框
*
*/
public Dialog createSingleChoiceDialog()
{
return new AlertDialog.Builder(this)
.setTitle("单选对话框") //设置对话框标题
.setNegativeButton("取消", null) //设置取消按钮钮
.setPositiveButton("确定", null) //设置确定按
.setSingleChoiceItems(items, 0, //绑定数据
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog,
int which)
{
Toast.makeText(getBaseContext(),
items[which].toString(),
Toast.LENGTH_SHORT).show();
}
}).create();
}
/**
* 创建多选对话框
*
*/
public Dialog createMultichoiceDialog()
{
return new AlertDialog.Builder(this)
.setTitle("多选对话框") //设置对话框标题
.setNegativeButton("取消", null) //设置取消按钮
.setPositiveButton("确定", null) //设置确定按钮
.setMultiChoiceItems(items, checkedItems, //绑定数据
new DialogInterface.OnMultiChoiceClickListener()
{
@Override
public void onClick(DialogInterface dialog,
int which, boolean isChecked)
{
Toast.makeText(
getBaseContext(),
isChecked ? items[which] + " check"
: items[which] + " uncheck",
Toast.LENGTH_SHORT).show();
}
}).create();
}
/**
* 创建带进度条的对话框
*
*/
public Dialog createProgressDialog()
{
progressDialog = new ProgressDialog(this);
progressDialog.setTitle("下载对话框");
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setMax(MAX_PROGRESS);
progressDialog.setButton(DialogInterface.BUTTON_POSITIVE, "确定", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
}
});
progressDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "取消", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
}
});
return progressDialog;
}
}
运行效果：
这里比较难理解还是ProgressDialog，因为它需要增加进度。这里我们通过向Activity线程发送消息，
从而能够使用progressDialog.incrementProgressBy(1)方法递增进度条。
时间： 2024-10-26 06:37:59