1.基本使用流程
- Step 1：創建AlertDialog.Builder對象；
- Step 2：調用setIcon()設置圖標，setTitle()或setCustomTitle()設置標題；
- Step 3：設置對話框的內容：setMessage()還有其他方法來指定顯示的內容；
- Step 4：調用setPositive/Negative/NeutralButton()設置：確定，取消，中立按鈕；
- Step 5：調用create()方法創建這個對象，再調用show()方法將對話框顯示出來；
2.幾種常用的對話框使用示例
運行效果圖：
核心代碼：
MainActivity.java：
public class MainActivity extends AppCompatActivity implements View.OnClickListener { private Button btn_dialog_one; private Button btn_dialog_two; private Button btn_dialog_three; private Button btn_dialog_four; private Context mContext; private boolean[] checkItems; private AlertDialog alert = null; private AlertDialog.Builder builder = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mContext = MainActivity.this; bindView(); } private void bindView() { btn_dialog_one = (Button) findViewById(R.id.btn_dialog_one); btn_dialog_two = (Button) findViewById(R.id.btn_dialog_two); btn_dialog_three = (Button) findViewById(R.id.btn_dialog_three); btn_dialog_four = (Button) findViewById(R.id.btn_dialog_four); btn_dialog_one.setOnClickListener(this); btn_dialog_two.setOnClickListener(this); btn_dialog_three.setOnClickListener(this); btn_dialog_four.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { //普通對話框 case R.id.btn_dialog_one: alert = null; builder = new AlertDialog.Builder(mContext); alert = builder.setIcon(R.mipmap.ic_icon_fish) .setTitle("系統提示：") .setMessage("這是一個最普通的AlertDialog,\n帶有三個按鈕，分別是取消，中立和確定") .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(mContext, "你點擊了取消按鈕~", Toast.LENGTH_SHORT).show(); } }) .setPositiveButton("確定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(mContext, "你點擊了確定按鈕~", Toast.LENGTH_SHORT).show(); } }) .setNeutralButton("中立", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(mContext, "你點擊了中立按鈕~", Toast.LENGTH_SHORT).show(); } }).create(); //創建AlertDialog對象 alert.show(); //顯示對話框 break; //普通列表對話框 case R.id.btn_dialog_two: final String[] lesson = new String[]{"語文", "數學", "英語", "化學", "生物", "物理", "體育"}; alert = null; builder = new AlertDialog.Builder(mContext); alert = builder.setIcon(R.mipmap.ic_icon_fish).setTitle("選擇你喜歡的課程").setItems(lesson,newDialogInterface.OnClickListener(){@Overridepublicvoid onClick(DialogInterface dialog,int which){Toast.makeText(getApplicationContext(),"你選擇了"+ lesson[which],Toast.LENGTH_SHORT).show();}}).create(); alert.show();break;//單選列表對話框case R.id.btn_dialog_three:finalString[] fruits =newString[]{"蘋果","雪梨","香蕉","葡萄","西瓜"}; alert =null; builder =newAlertDialog.Builder(mContext); alert = builder.setIcon(R.mipmap.ic_icon_fish).setTitle("選擇你喜歡的水果，只能選一個哦~").setSingleChoiceItems(fruits,0,newDialogInterface.OnClickListener(){@Overridepublicvoid onClick(DialogInterface dialog,int which){Toast.makeText(getApplicationContext(),"你選擇了"+ fruits[which],Toast.LENGTH_SHORT).show();}}).create(); alert.show();break;//多選列表對話框case R.id.btn_dialog_four:finalString[] menu =newString[]{"水煮豆腐","蘿卜牛腩","醬油雞","胡椒豬肚雞"};//定義一個用來記錄個列表項狀態的boolean數組 checkItems =newboolean[]{false,false,false,false}; alert =null; builder =newAlertDialog.Builder(mContext); alert = builder.setIcon(R.mipmap.ic_icon_fish).setMultiChoiceItems(menu, checkItems,newDialogInterface.OnMultiChoiceClickListener(){@Overridepublicvoid onClick(DialogInterface dialog,int which,boolean isChecked){ checkItems[which]= isChecked;}}).setPositiveButton("確定",newDialogInterface.OnClickListener(){@Overridepublicvoid onClick(DialogInterface dialog,int which){String result ="";for(int i =0; i < checkItems.length; i++){if(checkItems[i]) result += menu[i]+" ";}Toast.makeText(getApplicationContext(),"客官你點了:"+ result,Toast.LENGTH_SHORT).show();}}).create(); alert.show();break;}}}
布局就是四個簡單的按鈕，這里就不貼出來了，用法非常簡單~無非就是創建一個Builder對象后， 進行相關設置，然后create()生成一個AlertDialog對象，最后調用show()方法將AlertDialog 顯示出來而已！另外，細心的你可能發現我們點擊對話框的外部區域，對話框就會消失，我們 可以為builder設置setCancelable(false)即可解決這個問題！
3.通過Builder的setView()定制顯示的AlertDialog
我們可以自定義一個與系統對話框不同的布局，然后調用setView()將我們的布局加載到 AlertDialog上，上面我們來實現這個效果：
關鍵代碼：
首先是兩種不同按鈕的selctor的drawable文件：
btn_selctor_exit.xml：
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_pressed="true" android:drawable="@mipmap/iv_icon_exit_pressed"/> <item android:drawable="@mipmap/iv_icon_exit_normal"/> </selector>
btn_selctor_choose.xml：
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_pressed="true" android:drawable="@mipmap/bg_btn_pressed"/> <item android:drawable="@mipmap/bg_btn_normal"/> </selector>
接着是自定義的Dialog布局：view_dialog_custom.xml：
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/RelativeLayout1" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <RelativeLayout android:id="@+id/titlelayout" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:background="#53CC66" android:padding="5dp"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centerVertical="true" android:text="提示信息" android:textColor="#ffffff" android:textSize="18sp" android:textStyle="bold" /> <Button android:id="@+id/btn_cancle" android:layout_width="30dp" android:layout_height="30dp" android:layout_alignParentRight="true" android:background="@drawable/btn_selctor_exit" /> </RelativeLayout> <LinearLayout android:id="@+id/ly_detail" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@+id/titlelayout" android:layout_centerInParent="true" android:orientation="vertical"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:layout_marginTop="20dp" android:text="通過setView()方法定制AlertDialog" android:textColor="#04AEDA" android:textSize="18sp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:layout_marginTop="10dp" android:text="作者:Coder-pig" android:textColor="#04AEDA" android:textSize="18sp" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/ly_detail" android:layout_marginTop="10dp" android:orientation="horizontal"> <Button android:id="@+id/btn_blog" android:layout_width="match_parent" android:layout_height="40dp" android:layout_margin="5dp" android:layout_weight="1" android:background="@drawable/btn_selctor_choose" android:text="訪問博客" android:textColor="#ffffff" android:textSize="20sp" /> <Button android:id="@+id/btn_close" android:layout_width="match_parent" android:layout_height="40dp" android:layout_margin="5dp" android:layout_weight="1" android:background="@drawable/btn_selctor_choose" android:text="關閉" android:textColor="#ffffff" android:textSize="20sp" /> </LinearLayout> </RelativeLayout>
最后是MainActivity.java：
public class MainActivity extends AppCompatActivity {
private Button btn_show;
private View view_custom;
private Context mContext;
private AlertDialog alert = null;
private AlertDialog.Builder builder = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = MainActivity.this;
btn_show = (Button) findViewById(R.id.btn_show);
//初始化Builder
builder = new AlertDialog.Builder(mContext);
//加載自定義的那個View,同時設置下
final LayoutInflater inflater = MainActivity.this.getLayoutInflater();
view_custom = inflater.inflate(R.layout.view_dialog_custom, null,false);
builder.setView(view_custom);
builder.setCancelable(false);
alert = builder.create();
view_custom.findViewById(R.id.btn_cancle).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
alert.dismiss();
}
});
view_custom.findViewById(R.id.btn_blog).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "訪問博客", Toast.LENGTH_SHORT).show();
Uri uri = Uri.parse("http://blog.csdn.net/coder_pig");
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
alert.dismiss();
}
});
view_custom.findViewById(R.id.btn_close).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "對話框已關閉~", Toast.LENGTH_SHORT).show();
alert.dismiss();
}
});
btn_show.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
alert.show();
}
});
}
}