1.構(gòu)造一個(gè)簡(jiǎn)單的dialog并使用妆够。
public class Main3Activity extends AppCompatActivity {
private AlertDialog mDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
mDialog = new AlertDialog.Builder(this)
.setMessage("簡(jiǎn)單消息框")
.setPositiveButton("確定", null)
.create();
mDialog.show();
}
}
2.給dialog中的Message的內(nèi)容添加Scroll责静。
如果setMessage中的內(nèi)容太長(zhǎng)導(dǎo)致dialog顯示不全，此時(shí)可以將內(nèi)容設(shè)置成滾動(dòng)或者設(shè)置dialog的寬度和高度题翻。
AlertDialog dialog = new AlertDialog.Builder(this)
.setTitle("YOUR_TITLE")
.setMessage("YOUR_MSG")
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
})
.setIcon(android.R.drawable.ic_dialog_info)
.show();
TextView textView = (TextView) dialog.findViewById(android.R.id.message);
textView.setMaxLines(5);
textView.setScroller(new Scroller(this));
textView.setVerticalScrollBarEnabled(true);
textView.setMovementMethod(new ScrollingMovementMethod());
3.設(shè)置dialog的寬度和高度。
這里給出setAttributes塑荒、setContentView以及setLayout的這3種使用方法姜挺。注意：設(shè)置dialog大小的代碼必須放在dialog.show()之后炊豪，具體原因可參考這篇源碼分析Dialog自定義大小無(wú)效坑
setAttributes
AlertDialog dialog = builder.create();
dialog.setView(view);
dialog.show();
WindowManager m = getWindowManager();
Display d = m.getDefaultDisplay(); //為獲取屏幕寬、高
android.view.WindowManager.LayoutParams p = dialog.getWindow().getAttributes(); //獲取對(duì)話框當(dāng)前的參數(shù)值
p.height = (int) (d.getHeight() * 0.3); //高度設(shè)置為屏幕的0.3
p.width = (int) (d.getWidth() * 0.5); //寬度設(shè)置為屏幕的0.5
dialog.getWindow().setAttributes(p); //設(shè)置生效
setContentView
Dialog dialog = new Dialog(this, R.style.Dialog);
dialog.show();
LayoutInflater inflater = LayoutInflater.from(this);
View viewDialog = inflater.inflate(R.layout.adapter_list, null);
Display display = this.getWindowManager().getDefaultDisplay();
int width = display.getWidth();
int height = display.getHeight();
ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(width, height);
dialog.setContentView(viewDialog, layoutParams);
setLayout
dialog.show();
dialog.getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
有時(shí)候牵舱，是無(wú)法使用getWindowManager的芜壁，因此setLayout還是很有用處的高氮。
4.給dialog添加view。
以下是一個(gè)在dialog中添加EditText塞淹，并且監(jiān)聽(tīng)dialog的實(shí)例（應(yīng)用在沒(méi)有觸摸屏只有按鍵的設(shè)備）紊浩。
public class Main3Activity extends AppCompatActivity {
private EditText mEditText;
private AlertDialog mDialog;
@RequiresApi(api = Build.VERSION_CODES.M)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
mEditText = new EditText(this);
mDialog = new AlertDialog.Builder(this)
.setView(mEditText)
.setMessage("簡(jiǎn)單消息框")
.setPositiveButton("確定", null)
.setOnKeyListener(new DialogInterface.OnKeyListener() {
@Override
public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
if (mEditText.hasFocus()) {
mEditText.dispatchKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DEL));
}
break;
case KeyEvent.KEYCODE_DPAD_DOWN:
if (mEditText.hasFocus()) {
mEditText.clearFocus();
mDialog.getButton(DialogInterface.BUTTON_POSITIVE).requestFocus();
}
break;
}
return false;
}
})
.setCancelable(false)
.create();
mDialog.show();
}
}
這里通過(guò)調(diào)用setView坊谁，給dialog添加了一個(gè)EditText口芍。
不帶觸摸屏的設(shè)備EditText的焦點(diǎn)需要通過(guò)監(jiān)聽(tīng)按鍵去另外處理，而dialog中通過(guò)setOnKeyListener監(jiān)聽(tīng)按鍵颠猴。至于是否攔截事件小染，看具體需求，如果需要攔截就返回true资盅，因?yàn)榉祷豻rue就會(huì)消費(fèi)事件，消費(fèi)掉了就等于攔截掉了每庆。
而由于不帶觸屏的設(shè)備沒(méi)有刪除功能今穿，mEditText.dispatchKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DEL));就相當(dāng)于軟鍵盤的刪除鍵，因此case KeyEvent.KEYCODE_BACK中添加該代碼腮出。
還有就是不帶觸屏的設(shè)備中EditText焦點(diǎn)處理問(wèn)題芝薇。此時(shí)需通過(guò)監(jiān)聽(tīng)KEYCODE_DPAD_DOWN去清除焦點(diǎn)（調(diào)用clearFocus）剩燥，并且button需請(qǐng)求焦點(diǎn)（可通過(guò)AlertDialog 中的getButton(DialogInterface.BUTTON_POSITIVE)獲取到button立倍，然后調(diào)用requestFocus請(qǐng)求焦點(diǎn)）。
setCancelable(false);
是設(shè)置點(diǎn)擊屏幕或物理返回鍵变擒，dialog不消失寝志。
如果在不帶觸屏的設(shè)備中，如果setMessage的內(nèi)容太長(zhǎng)毫缆，并且就算設(shè)置了寬度和高度也無(wú)法解決顯示不全的問(wèn)題的話乐导，就可以通過(guò)setView添加一個(gè)帶Scrollview的layout文件去代替setMessage去顯示物臂。
public class Main3Activity extends AppCompatActivity {
private AlertDialog mDialog;
private ScrollView mScrollView;
private EditText mEditText;
private View mView;
private boolean isScrollTop;
private boolean isScrollBottom;
private boolean isFocusInEditText;
private boolean isFocusInScroll = true;
private boolean isFocusInButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
mView = getLayoutInflater().inflate(R.layout.layout_view, null);
mEditText = (EditText) mView.findViewById(R.id.edit_text);
mScrollView = (ScrollView) mView.findViewById(R.id.scroll_view);
mDialog = new AlertDialog.Builder(this)
.setView(mView)
.setOnKeyListener(new DialogInterface.OnKeyListener() {
@Override
public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
if (event.getKeyCode() == KeyEvent.KEYCODE_DPAD_UP && KeyEvent.ACTION_UP==event.getAction()){
if (isFocusInButton){
mDialog.getButton(DialogInterface.BUTTON_POSITIVE).clearFocus();
mEditText.requestFocus();
isFocusInEditText = true;
isFocusInButton = false;
}else if (mScrollView.getScrollY() <= 0 && !isScrollTop) {
isFocusInScroll = true;
isScrollBottom = false;
isScrollTop = true;
}else if (isFocusInEditText){
mEditText.clearFocus();
mScrollView.requestFocus();
isFocusInEditText = false;
isFocusInScroll = true;
}
}
if (event.getKeyCode() == KeyEvent.KEYCODE_DPAD_DOWN && KeyEvent.ACTION_UP==event.getAction()){
if (mScrollView.getChildAt(0).getMeasuredHeight() <=
mScrollView.getHeight() + mScrollView.getScrollY() && !isScrollBottom) {
isScrollBottom = true;
isFocusInScroll = true;
isScrollTop = false;
}else if (isFocusInScroll && isScrollBottom){
mScrollView.clearFocus();
mEditText.requestFocus();
isFocusInEditText = true;
isFocusInScroll = false;
}else if (isFocusInEditText){
mEditText.clearFocus();
mDialog.getButton(DialogInterface.BUTTON_POSITIVE).requestFocus();
isFocusInEditText = false;
isFocusInButton = true;
}
}
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
if (mEditText.hasFocus()) {
mEditText.dispatchKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DEL));
}
break;
}
return false;
}
})
.setPositiveButton("確定", null)
.setCancelable(false)
.create();
mDialog.show();
}
}
由于上下按鍵部分時(shí)候會(huì)響應(yīng)2次蛾狗，所以監(jiān)聽(tīng)中需加上
event.getKeyCode() == KeyEvent.KEYCODE_DPAD_UP && KeyEvent.ACTION_UP==event.getAction()或event.getKeyCode() == KeyEvent.KEYCODE_DPAD_DOWN && KeyEvent.ACTION_UP==event.getAction()
layout_view.xml如下所示仪媒。
<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:orientation="vertical"
tools:context="com.example.admin.myapplication.Main3Activity">
<ScrollView
android:id="@+id/scroll_view"
android:layout_width="match_parent"
android:layout_height="100dp">
<TextView
android:id="@+id/text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框簡(jiǎn)單消息框11" />
</ScrollView>
<EditText
android:id="@+id/edit_text"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
參考鏈接：
Adding a vertical scrollbar to an AlertDialog in Android?
Android Dialog AlertDialog 設(shè)置高度和寬度
Android：修改AlertDialog的背景并動(dòng)態(tài)控制AlertDialog的最大高度
對(duì)話框中dialog.setCancelable與setCanceledOnTouchOutside的區(qū)別
android AlertDialog setView rules
Android-使用ScrollView設(shè)置滾動(dòng)界面
