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);

    }

}

巴特西

OnClick五种事件处理

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