Android实现监听EditText编辑完成事件

   EditText中并没有实现该功能的代码，所以我们只能另外想方法了，具体的实现思路有两个：一是通过监听键盘的弹起，二是通过监听EditText输入变化然后handler发送延迟消息来实现。

   通过键盘的弹起来实现该功能比较麻烦，不考虑其他情况在布局最简单的情况下，代码实现如下：

   

public class MainActivity extends AppCompatActivity implements View.OnLayoutChangeListener {

    private LinearLayout layout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        layout = (LinearLayout) findViewById(R.id.ll);
        layout.addOnLayoutChangeListener(this);
    }

    @Override
    public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
        Log.e("TAG", "onLayoutChange: bottom" + bottom + " ---- oldBottom" + oldBottom);
        if(bottom > oldBottom && oldBottom != 0){
            //键盘收起
            Log.e("TAG", "onLayoutChange:  键盘被收起了");
            //执行相关操作
        }
    }
}

<activity android:name=".MainActivity"
          android:windowSoftInputMode="stateAlwaysHidden|adjustResize">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />

        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/ll"
    android:orientation="vertical"
    tools:context="com.test.keyboardactivity.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="200dp" />

</LinearLayout>

      上面描述的是布局最简单的情况，所以这种实现方式比较复杂，下面介绍一下通过发送延迟消息来实现的方法，

代码如下：

public class MainActivity extends AppCompatActivity implements View.OnLayoutChangeListener {

    private LinearLayout layout;
    private EditText editText;

    private static Handler handler = new Handler();

    private long TIME_LISTEN = 2000;//设置2秒的延迟

    private Runnable runnable = new Runnable() {
        @Override
        public void run() {
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    doSomeThing(editText.getText().toString());
                }
            });
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        layout = (LinearLayout) findViewById(R.id.ll);
        layout.addOnLayoutChangeListener(this);

        editText = (EditText) findViewById(R.id.et);
        editText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                handler.removeCallbacks(runnable);
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }

            @Override
            public void afterTextChanged(Editable s) {
                if (!"".equals(s.toString().trim())) {
                    handler.postDelayed(runnable, TIME_LISTEN);
                }
            }
        });
    }

    //方法一：
    @Override
    public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
        Log.e("TAG", "onLayoutChange: bottom" + bottom + " ---- oldBottom" + oldBottom);
        if (bottom > oldBottom && oldBottom != 0) {
            //键盘收起
            Log.e("TAG", "onLayoutChange:  键盘被收起了");
            //执行相关操作
            String s = editText.getText().toString();
//            if(!"".equals(s.trim())){
//                doSomeThing(s);
//            }
        }
    }


    //执行操作
    private void doSomeThing(String s) {
        Toast.makeText(this, s, Toast.LENGTH_SHORT).show();
    }
}