OnClick五种事件处理

（一）内部类

1,布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:orientation="vertical"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="helloworld.com.inspur.app2.MainActivity">
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/et"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/but"
        android:text="点击显示"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tv_show"
        />

</LinearLayout>

2，逻辑处理

package helloworld.com.inspur.demo6;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import org.w3c.dom.Text;

public class MainActivity extends AppCompatActivity {
    private EditText et;
    private TextView tv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et=(EditText)findViewById(R.id.et);
        tv=(TextView)findViewById(R.id.tv);
        et.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                switch (event.getKeyCode())
                {
                    case KeyEvent.KEYCODE_A:
                        tv.setText("AAAAAA");
                        break;
                    case KeyEvent.KEYCODE_B:
                        tv.setText("BBB");
                        break;
                    case KeyEvent.KEYCODE_C:
                         tv.setText("CCC");
                        break;
                    case KeyEvent.KEYCODE_D:
                        tv.setText("DDD");
                        break;
                }
                return false;
            }
        });
    }
}

（二）外部类

1，布局同上

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:orientation="vertical"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="helloworld.com.inspur.app2.MainActivity">
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/et"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/but"
        android:text="点击显示"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tv_show"
        />

</LinearLayout>

2，逻辑处理

package helloworld.com.inspur.app2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
    private EditText ed;
    private Button but;
    private TextView tv_show;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ed=(EditText)findViewById(R.id.et);
        but=(Button)findViewById(R.id.but);
        tv_show=(TextView)findViewById(R.id.tv_show);
        but.setOnClickListener(new DoClick(ed,tv_show));

    }

}
class DoClick implements View.OnClickListener{
    private EditText ed;
    private TextView tv_show;

    public DoClick(EditText ed, TextView tv_show) {
        this.ed = ed;
        this.tv_show = tv_show;
    }

    @Override
    public void onClick(View v) {
        String str=ed.getText().toString();
        tv_show.setText(str);
    }
}

3，相对比于内部类的处理方式

不可以使用MainActivity中的成员变量，需要通过带参数的构造函数的方式将两个参数对应起来。

（三）匿名内部类

1，布局同上

2，逻辑代码处理

package helloworld.com.inspur.app2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
    private EditText ed;
    private Button but;
    private TextView tv_show;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ed=(EditText)findViewById(R.id.et);
        but=(Button)findViewById(R.id.but);
        tv_show=(TextView)findViewById(R.id.tv_show);
        but.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String str=ed.getText().toString();
                tv_show.setText(str);
            }
        });

    }

}

（四）本类实现

package helloworld.com.inspur.app2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    private EditText ed;
    private Button but;
    private TextView tv_show;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ed=(EditText)findViewById(R.id.et);
        but=(Button)findViewById(R.id.but);
        tv_show=(TextView)findViewById(R.id.tv_show);
        but.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        String str=ed.getText().toString();
        tv_show.setText(str);
    }
}

（五）组建绑定事件

1，布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:orientation="vertical"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="helloworld.com.inspur.app2.MainActivity">
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/et"/>
    <Button
        android:onClick="doClick"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/but"
        android:text="点击显示"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tv_show"
        />

</LinearLayout>

2，逻辑代码的实现

package helloworld.com.inspur.app2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity{
    private EditText ed;
    private TextView tv_show;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ed=(EditText)findViewById(R.id.et);
        tv_show=(TextView)findViewById(R.id.tv_show);
    }
    public void doClick(View v)
    {
        String str=ed.getText().toString();
        tv_show.setText(str);
    }
}