1.构造一个简单的dialog并使用。
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("简单消息框")
.setPositiveButton("确定", null)
.create();
mDialog.show();
}
}
2.给dialog中的Message的内容添加Scroll。
如果setMessage中的内容太长导致dialog显示不全,此时可以将内容设置成滚动或者设置dialog的宽度和高度。
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.设置dialog的宽度和高度。
这里给出setAttributes、setContentView以及setLayout的这3种使用方法。注意:设置dialog大小的代码必须放在dialog.show()之后,具体原因可参考这篇源码分析Dialog自定义大小无效坑
setAttributes
AlertDialog dialog = builder.create();
dialog.setView(view);
dialog.show();
WindowManager m = getWindowManager();
Display d = m.getDefaultDisplay(); //为获取屏幕宽、高
android.view.WindowManager.LayoutParams p = dialog.getWindow().getAttributes(); //获取对话框当前的参数值
p.height = (int) (d.getHeight() * 0.3); //高度设置为屏幕的0.3
p.width = (int) (d.getWidth() * 0.5); //宽度设置为屏幕的0.5
dialog.getWindow().setAttributes(p); //设置生效
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);
有时候,是无法使用getWindowManager的,因此setLayout还是很有用处的。
4.给dialog添加view。
以下是一个在dialog中添加EditText,并且监听dialog的实例(应用在没有触摸屏只有按键的设备)。
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("简单消息框")
.setPositiveButton("确定", 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();
}
}
这里通过调用setView,给dialog添加了一个EditText。
不带触摸屏的设备EditText的焦点需要通过监听按键去另外处理,而dialog中通过setOnKeyListener监听按键。至于是否拦截事件,看具体需求,如果需要拦截就返回true,因为返回true就会消费事件,消费掉了就等于拦截掉了。
而由于不带触屏的设备没有删除功能,mEditText.dispatchKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DEL));
就相当于软键盘的删除键,因此case KeyEvent.KEYCODE_BACK中添加该代码。
还有就是不带触屏的设备中EditText焦点处理问题。此时需通过监听KEYCODE_DPAD_DOWN去清除焦点(调用clearFocus),并且button需请求焦点(可通过AlertDialog 中的getButton(DialogInterface.BUTTON_POSITIVE)获取到button,然后调用requestFocus请求焦点)。
setCancelable(false);
是设置点击屏幕或物理返回键,dialog不消失。
如果在不带触屏的设备中,如果setMessage的内容太长,并且就算设置了宽度和高度也无法解决显示不全的问题的话,就可以通过setView添加一个带Scrollview的layout文件去代替setMessage去显示。
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("确定", null)
.setCancelable(false)
.create();
mDialog.show();
}
}
由于上下按键部分时候会响应2次,所以监听中需加上
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。
参考链接:
Adding a vertical scrollbar to an AlertDialog in Android?
Android Dialog AlertDialog 设置高度和宽度
Android Dialog全屏显示
Android:修改AlertDialog的背景并动态控制AlertDialog的最大高度
源码分析Dialog自定义大小无效坑
按钮控制EditText删除单个字符
Android 拦截返回键事件
对话框中dialog.setCancelable与setCanceledOnTouchOutside的区别
android AlertDialog setView rules
Android-使用ScrollView设置滚动界面
android监听软键盘回车键并且解决默认点击两次的问题
android scrollview 不滑动