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使用Handler的延遲發(fā)送實(shí)現(xiàn)：
private static final int MESSAGE_SEARCH = 0x1;
private static long INTERVAL = 1000; // 輸入變化時(shí)間間隔
Handler mHandler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg.what == MESSAGE_SEARCH){
mTextView.setText("搜索key:" + mEditText.getText().toString());
}
}
};
// 設(shè)置監(jiān)聽(tīng)
mEditText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) { }
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {}
@Override
public void afterTextChanged(Editable s) {
if (mHandler.hasMessages(MESSAGE_SEARCH)) {
mHandler.removeMessages(MESSAGE_SEARCH);
}
mHandler.sendEmptyMessageDelayed(MESSAGE_SEARCH, INTERVAL);
}
});
一般使用Handler會(huì)有一個(gè)內(nèi)存泄漏的提示：
Paste_Image.png
可以使用WeakReference弱引用來(lái)避免：
MyHandler mHandler = new MyHandler(this);
private static class MyHandler extends Handler {
WeakReference<SearchEditActivity> mActivityReference;
MyHandler(SearchEditActivity activity) {
mActivityReference= new WeakReference<SearchEditActivity>(activity);
}
@Override
public void handleMessage(Message msg) {
SearchEditActivity activity = mActivityReference.get();
if (activity != null) {
activity.handleMessage(msg);
}
}
}
private void handleMessage(Message message){
if (message.what == MESSAGE_SEARCH){
mTextView.setText("搜索key:" + mEditText.getText().toString());
}
}
Paste_Image.png
