Bước 1: Mở file res-> layout ->layout_main.xml
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| android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="10dp" android:paddingRight="10dp" android:paddingTop="20dp" tools:context=".MainActivity" ><EditText android:id="@+id/et1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:hint="@string/hello_world" /><TextView android:id="@+id/tv1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@+id/et1" /></RelativeLayout> |
Bước 2: Mở file src-> MainActivity.java
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| package com.example.activitydemo2;import android.app.Activity;import android.os.Bundle;import android.text.Editable;import android.text.TextWatcher;import android.util.Log;import android.view.KeyEvent;import android.view.Menu;import android.view.MotionEvent;import android.widget.EditText;import android.widget.TextView;public class MainActivity extends Activity { private EditText et1; private TextView tv1;@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); et1 = (EditText) findViewById(R.id.et1); tv1 = (TextView) findViewById(R.id.tv1);// lang nghe su kien EditText thay doi et1.addTextChangedListener(new TextWatcher() {@Override public void onTextChanged(CharSequence s, int start, int before, int count) { // TODO Auto-generated method stub // phuong thuc goi khi Text trong EditText duoc thay doi // gia tri s o trong phuong thuc nay da la gia tri cua chuoi trong EditText // da duoc thay doi Log.d("debug", "onTextChanged s: " + s + " start: " + start + " before: " + before + " count: " + count);}@Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { // TODO Auto-generated method stub // phuong thuc goi truoc khi Text trong EditText duoc thay doi // s la gia tri chuoi truoc khi thay doi start la vi tri chuoi bi thay doi // neu after = 1 co nghi la chuoi da duoc them 1 ky tu vao phia sau vi tri start // neu la xoa ky tu thi after = 0 va gia tri before trong phuong thuc onTextChanged se =1 Log.d("debug", "beforeTextChanged s: " + s + " start: " + start + " after: " + after + " count: " + count);}@Override public void afterTextChanged(Editable s) { // TODO Auto-generated method stub // phuong thuc goi sau khi Text trong EditText duoc thay doi Log.d("debug", "s: " + s); // khi chuoi da duoc thay doi minh set gia tri EditText cho TextView tv1.setText(s);} }); }// co 2 cach de bat su kien bam vao phim Back // 1 la override onBackPressed() // 2 la kiem tra keyCode == KeyEvent.KEYCODE_BACK nhu trong phuong thuc // onKeyDown @Override public void onBackPressed() { // TODO Auto-generated method stub // thuc hien lenh khi bam vao phim Back Log.d("debug", "1. onBackPressed"); super.onBackPressed(); }@Override public boolean onTouchEvent(MotionEvent event) { // TODO Auto-generated method stub // phuong thuc onTouchEvent duoc goi khi nguoi dung // cham vao man hinh trong vi du nay khi nguoi dung // cham vao man hinh (ACTION_DOWN) nhac tay len (ACTION_UP) // di chuyen tren man hinh(ACTION_MOVE) minh se ghi log laiif (event.getAction() == MotionEvent.ACTION_DOWN) { Log.d("debug", "ACTION_DOWN"); }if (event.getAction() == MotionEvent.ACTION_UP) { Log.d("debug", "ACTION_UP"); }if (event.getAction() == MotionEvent.ACTION_MOVE) { float x = event.getX(); float y = event.getY(); Log.d("debug", "ACTION_MOVE " + "x: " + x + " y: " + y); }return super.onTouchEvent(event); }@Override public boolean onKeyDown(int keyCode, KeyEvent event) { // TODO Auto-generated method stub// phuong thuc onKeyDown duoc goi khi co su kien 1 phim duoc bam xuong // trong vi du nay minh bat su kien bat vao cac Phim Cung tren DT // android // va log ra man hinh if (keyCode == KeyEvent.KEYCODE_BACK) { Log.d("debug", "2. Press BACK");}if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) { Log.d("debug", "Press VOLUME DOWN");}if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) { Log.d("debug", "Press VOLUME UP");}return super.onKeyDown(keyCode, event); }@Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; }} |
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