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怎么在Android中實現一個對話框?針對這個問題,這篇文章詳細介紹了相對應的分析和解答,希望可以幫助更多想解決這個問題的小伙伴找到更簡單易行的方法。
2個按鈕
public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button buttonNormal = (Button) findViewById(R.id.button_normal); buttonNormal.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { showNormalDialog(); } }); } private void showNormalDialog(){ /* @setIcon 設置對話框圖標 * @setTitle 設置對話框標題 * @setMessage 設置對話框消息提示 * setXXX方法返回Dialog對象,因此可以鏈式設置屬性 */ final AlertDialog.Builder normalDialog = new AlertDialog.Builder(MainActivity.this); normalDialog.setIcon(R.drawable.icon_dialog); normalDialog.setTitle("我是一個普通Dialog") normalDialog.setMessage("你要點擊哪一個按鈕呢?"); normalDialog.setPositiveButton("確定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { //...To-do } }); normalDialog.setNegativeButton("關閉", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { //...To-do } }); // 顯示 normalDialog.show(); } }
3個按鈕
/* @setNeutralButton 設置中間的按鈕 * 若只需一個按鈕,僅設置 setPositiveButton 即可 */ private void showMultiBtnDialog(){ AlertDialog.Builder normalDialog = new AlertDialog.Builder(MainActivity.this); normalDialog.setIcon(R.drawable.icon_dialog); normalDialog.setTitle("我是一個普通Dialog").setMessage("你要點擊哪一個按鈕呢?"); normalDialog.setPositiveButton("按鈕1", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // ...To-do } }); normalDialog.setNeutralButton("按鈕2", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // ...To-do } }); normalDialog.setNegativeButton("按鈕3", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // ...To-do } }); // 創建實例并顯示 normalDialog.show(); }
2.2 列表Dialog(圖3)
private void showListDialog() { final String[] items = { "我是1","我是2","我是3","我是4" }; AlertDialog.Builder listDialog = new AlertDialog.Builder(MainActivity.this); listDialog.setTitle("我是一個列表Dialog"); listDialog.setItems(items, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // which 下標從0開始 // ...To-do Toast.makeText(MainActivity.this, "你點擊了" + items[which], Toast.LENGTH_SHORT).show(); } }); listDialog.show(); }
2.3 單選Dialog(圖4)
int yourChoice; private void showSingleChoiceDialog(){ final String[] items = { "我是1","我是2","我是3","我是4" }; yourChoice = -1; AlertDialog.Builder singleChoiceDialog = new AlertDialog.Builder(MainActivity.this); singleChoiceDialog.setTitle("我是一個單選Dialog"); // 第二個參數是默認選項,此處設置為0 singleChoiceDialog.setSingleChoiceItems(items, 0, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { yourChoice = which; } }); singleChoiceDialog.setPositiveButton("確定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { if (yourChoice != -1) { Toast.makeText(MainActivity.this, "你選擇了" + items[yourChoice], Toast.LENGTH_SHORT).show(); } } }); singleChoiceDialog.show(); }
2.4 多選Dialog(圖5)
ArrayList<Integer> yourChoices = new ArrayList<>(); private void showMultiChoiceDialog() { final String[] items = { "我是1","我是2","我是3","我是4" }; // 設置默認選中的選項,全為false默認均未選中 final boolean initChoiceSets[]={false,false,false,false}; yourChoices.clear(); AlertDialog.Builder multiChoiceDialog = new AlertDialog.Builder(MainActivity.this); multiChoiceDialog.setTitle("我是一個多選Dialog"); multiChoiceDialog.setMultiChoiceItems(items, initChoiceSets, new DialogInterface.OnMultiChoiceClickListener() { @Override public void onClick(DialogInterface dialog, int which, boolean isChecked) { if (isChecked) { yourChoices.add(which); } else { yourChoices.remove(which); } } }); multiChoiceDialog.setPositiveButton("確定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { int size = yourChoices.size(); String str = ""; for (int i = 0; i < size; i++) { str += items[yourChoices.get(i)] + " "; } Toast.makeText(MainActivity.this, "你選中了" + str, Toast.LENGTH_SHORT).show(); } }); multiChoiceDialog.show(); }
2.5 等待Dialog(圖6)
private void showWaitingDialog() { /* 等待Dialog具有屏蔽其他控件的交互能力 * @setCancelable 為使屏幕不可點擊,設置為不可取消(false) * 下載等事件完成后,主動調用函數關閉該Dialog */ ProgressDialog waitingDialog= new ProgressDialog(MainActivity.this); waitingDialog.setTitle("我是一個等待Dialog"); waitingDialog.setMessage("等待中..."); waitingDialog.setIndeterminate(true); waitingDialog.setCancelable(false); waitingDialog.show(); }
2.6 進度條Dialog(圖7)
private void showProgressDialog() { /* @setProgress 設置初始進度 * @setProgressStyle 設置樣式(水平進度條) * @setMax 設置進度最大值 */ final int MAX_PROGRESS = 100; final ProgressDialog progressDialog = new ProgressDialog(MainActivity.this); progressDialog.setProgress(0); progressDialog.setTitle("我是一個進度條Dialog"); progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); progressDialog.setMax(MAX_PROGRESS); progressDialog.show(); /* 模擬進度增加的過程 * 新開一個線程,每個100ms,進度增加1 */ new Thread(new Runnable() { @Override public void run() { int progress= 0; while (progress < MAX_PROGRESS){ try { Thread.sleep(100); progress++; progressDialog.setProgress(progress); } catch (InterruptedException e){ e.printStackTrace(); } } // 進度達到最大值后,窗口消失 progressDialog.cancel(); } }).start(); }
2.7 編輯Dialog(圖8)
private void showInputDialog() { /*@setView 裝入一個EditView */ final EditText editText = new EditText(MainActivity.this); AlertDialog.Builder inputDialog = new AlertDialog.Builder(MainActivity.this); inputDialog.setTitle("我是一個輸入Dialog").setView(editText); inputDialog.setPositiveButton("確定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(MainActivity.this, editText.getText().toString(), Toast.LENGTH_SHORT).show(); } }).show(); }
2.8 自定義Dialog(圖9)
<!-- res/layout/dialog_customize.xml--> <!-- 自定義View --> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <EditText android:id="@+id/edit_text" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout>
private void showCustomizeDialog() { /* @setView 裝入自定義View ==> R.layout.dialog_customize * 由于dialog_customize.xml只放置了一個EditView,因此和圖8一樣 * dialog_customize.xml可自定義更復雜的View */ AlertDialog.Builder customizeDialog = new AlertDialog.Builder(MainActivity.this); final View dialogView = LayoutInflater.from(MainActivity.this) .inflate(R.layout.dialog_customize,null); customizeDialog.setTitle("我是一個自定義Dialog"); customizeDialog.setView(dialogView); customizeDialog.setPositiveButton("確定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // 獲取EditView中的輸入內容 EditText edit_text = (EditText) dialogView.findViewById(R.id.edit_text); Toast.makeText(MainActivity.this, edit_text.getText().toString(), Toast.LENGTH_SHORT).show(); } }); customizeDialog.show(); }
3.復寫回調函數
/* 復寫Builder的create和show函數,可以在Dialog顯示前實現必要設置 * 例如初始化列表、默認選項等 * @create 第一次創建時調用 * @show 每次顯示時調用 */ private void showListDialog() { final String[] items = { "我是1","我是2","我是3","我是4" }; AlertDialog.Builder listDialog = new AlertDialog.Builder(MainActivity.this){ @Override public AlertDialog create() { items[0] = "我是No.1"; return super.create(); } @Override public AlertDialog show() { items[1] = "我是No.2"; return super.show(); } }; listDialog.setTitle("我是一個列表Dialog"); listDialog.setItems(items, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // ...To-do } }); /* @setOnDismissListener Dialog銷毀時調用 * @setOnCancelListener Dialog關閉時調用 */ listDialog.setOnDismissListener(new DialogInterface.OnDismissListener() { public void onDismiss(DialogInterface dialog) { Toast.makeText(getApplicationContext(), "Dialog被銷毀了", Toast.LENGTH_SHORT).show(); } }); listDialog.show(); }
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