Android Toast 长期显示解决方案
Android Toast 长期显示解决方案
Toast是Android中用来显示显示信息的一种机制，和Dialog不一样的是，
Toast是没有焦点的，而且Toast显示的时间有限， 过一定的时间就会自动消失。
下面用一个实例来看看如何使用Toast。
首先建立一个ToastExample的项目，放置3个按钮，分别为 Text Only，Icon Only，Text and Icon。
Text Only
Toast.makeText(getApplicationContext(), "Text toast test!", Toast.LENGTH_LONG).show();
Icon Only
? ? ? Toast toast = new Toast(getApplicationContext());
? ? ? ? ImageView view = new ImageView(getApplicationContext());
? ? ? ? view.setImageResource(R.drawable.ic_dialog_alert);
? ? ? ? toast.setView(view);
? ? ? ? toast.show();
Text and Icon
? ? ? Toast toast = Toast.makeText(getApplicationContext(), "Text and Icon test!", Toast.LENGTH_LONG);
? ? ? ? View textView = toast.getView();
? ? ? ? LinearLayout lay = new LinearLayout(getApplicationContext());
? ? ? ? lay.setOrientation(LinearLayout.HORIZONTAL);
? ? ? ? ImageView view = new ImageView(getApplicationContext());
? ? ? ? view.setImageResource(R.drawable.ic_dialog_alert);
? ? ? ? lay.addView(view);
? ? ? ? lay.addView(textView);
? ? ? ? toast.setView(lay);
? ? ? ? toast.show();
自己写了一个简化类，把Toast封装在里面，可以满足基本应用。
public class MyToast {
private static final String TAG = "MyToast";
public static final int LENGTH_MAX = -1; //show until hide() function invoked
boolean mCanceled = true;
Handler mHandler;
Context mContext;
Toast mToast;
public MyToast(Context context) {
this(context,new Handler());
}
public MyToast(Context context,Handler h) {
mContext = context;
mHandler = h;
mToast = Toast.makeText(mContext,"",Toast.LENGTH_SHORT);
mToast.setGravity(Gravity.BOTTOM, 0, 0);
}
public void show(int resId,int duration) {
mToast.setText(resId);
if(duration != LENGTH_MAX) {
mToast.setDuration(duration);
mToast.show();
} else if(mCanceled) {
mToast.setDuration(Toast.LENGTH_LONG);
mCanceled = false;
showUntilCancel();
}
}
public void show(String text,int duration) {
mToast.setText(text);
if(duration != LENGTH_MAX) {
mToast.setDuration(duration);
mToast.show();
} else {
if(mCanceled) {
mToast.setDuration(Toast.LENGTH_LONG);
mCanceled = false;
showUntilCancel();
}
}
}
public void hide() {
Log.d(TAG,"hide");
mToast.cancel();
mCanceled = true;
}
public boolean isShowing() {
return !mCanceled;
}
private void showUntilCancel() {
if(mCanceled)
return;
mToast.show();
mHandler.postDelayed(new Runnable() {
public void run() {
showUntilCancel();
}
},3000);
}
}