Android 如果布尔值为真，则覆盖主页和后退按钮
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Override home and back button is case a boolean is true
提问by Diego
I was wondering if I can override the action of the back and home button is some cases. Normally these buttons should just react like they always do, but in a case some setting is true I want to override the buttons and let them call my own methods.
我想知道在某些情况下是否可以覆盖后退和主页按钮的操作。通常这些按钮应该像往常一样做出反应，但在某些设置为真的情况下，我想覆盖这些按钮并让它们调用我自己的方法。
I′m using these two methods to override these buttons:
我正在使用这两种方法来覆盖这些按钮：
@Override
public void onBackPressed() {
// call my backbutton pressed method when boolean==true
}
@Override
public void onAttachedToWindow() { this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
super.onAttachedToWindow();
// call my homebutton pressed method when boolean==true
}
回答by Mohammed Azharuddin Shaikh
I was wondering if I can override the action of the back and home button is some cases.
我想知道在某些情况下是否可以覆盖后退和主页按钮的操作。
Yes you can do override Homebutton.
是的，您可以执行覆盖Home按钮。
I have developed an application which disable hard button, you can have a look. I have taken a toggle buttonwhich locks all hard button to work except Powerbutton
我开发了一个禁用硬按钮的应用程序，你可以看看。我使用了一个切换按钮，它可以锁定除电源按钮之外的所有硬按钮工作
public class DisableHardButton extends Activity {
/** Called when the activity is first created. */
TextView mTextView;
ToggleButton mToggleButton;
boolean isLock=false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mTextView=(TextView) findViewById(R.id.tvInfo);
mToggleButton=(ToggleButton) findViewById(R.id.btnLock);
mToggleButton.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
isLock=isChecked;
onAttachedToWindow();
}
});
}
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if ( (event.getKeyCode() == KeyEvent.KEYCODE_HOME) && isLock) {
mTextView.setText("KEYCODE_HOME");
return true;
}
else
return super.dispatchKeyEvent(event);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if( (keyCode==KeyEvent.KEYCODE_BACK) && isLock)
{
mTextView.setText("KEYCODE_BACK");
return true;
}
else
return super.onKeyDown(keyCode, event);
}
@Override
public void onAttachedToWindow()
{
System.out.println("Onactivity attached :"+isLock);
if(isLock)
{
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
super.onAttachedToWindow();
}
else
{
this.getWindow().setType(WindowManager.LayoutParams.TYPE_APPLICATION);
super.onAttachedToWindow();
}
}
}
main.xml
主文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/tvInfo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<ToggleButton
android:id="@+id/btnLock"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textOff="UnLocked"
android:textOn="Locked" />
</LinearLayout>
回答by NitroG42
You call super.onBackPressed() to call the normal method. Exemple :
您调用 super.onBackPressed() 来调用普通方法。例子：
@Override
public void onBackPressed() {
if (activated) {
//doyourthing
} else {
super.onBackPressed()
}
}
回答by Blackbelt
No you can not. What you can do is to ovveride the method and manage the boolean inside it:
你不能。您可以做的是覆盖该方法并管理其中的布尔值：
for instance:
例如：
public void onBackPressed() { // call my backbutton pressed method when boolean==true
if (myCondition) {
// take care of my needs
} else
// call super to let the back behavior be "normal"
}
回答by Adil Soomro
Regarding overriding the behaviour of Home Button you are out of luck.
关于覆盖主页按钮的行为，您很不走运。
However if your app is a specific one and have limited targeted audience, like inter-organization app, hospital kiosk, restaurant ordering, you can try making your app as Home (the launcher app). You can find a good example here: How to Write Custom Launcher App in Android
但是，如果您的应用程序是特定的并且目标受众有限，例如跨组织应用程序、医院信息亭、餐厅订购，您可以尝试将您的应用程序设为 Home（启动器应用程序）。你可以在这里找到一个很好的例子：How to Write Custom Launcher App in Android
And to override the back key events, lot of examples are there.
为了覆盖后退键事件，有很多例子。
For example:
例如：
回答by vipin
make your boolean variable member variable
使您的布尔变量成为成员变量
boolean temp;
@Override
public void onBackPressed() { // call my backbutton pressed method when boolean==true
if(temp)
//your methode
else
finish();
}
回答by Bigflow
I use this:
我用这个：
public void onBackPressed() {
switch (screen) {
case 1:
screen = 99;
setContentView(R.layout.menu);
break;
case 99:
finish();
break;
}
return;
}
When I am in a other screen (other then menu screen), I set the variable screen to 1. When I press the back button, it goes back to the menu screen (instead of killing the app). and give the screen variable the number 99, then when you hit the back button again, it kills the app.
当我在另一个屏幕（菜单屏幕之外）时，我将变量屏幕设置为 1。当我按下后退按钮时，它会返回到菜单屏幕（而不是终止应用程序）。并为屏幕变量指定数字 99，然后当您再次点击后退按钮时，它会杀死应用程序。
However, you can't change the home button.
但是，您无法更改主页按钮。
