android学习笔记003-点击事件的四种写法

一个按钮对点击事件相应的四种方法。

1、通过新建一个借口类来具体实现点击时间的响应：

package com.example.dailcall;

import android.support.v7.app.ActionBarActivity;
import android.text.TextUtils;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;//创建 OnClickListener接口的时候要导入这个包
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {

    // 定义组建
    private EditText et;
    private Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et=(EditText) findViewById(R.id.et_number); //通过findViewById来查找组建名，绑定到定义的组建变量。
        btn=(Button) findViewById(R.id.btn_dail);
        btn.setOnClickListener(new MyClickListener());//通过新建一个借口类来具体实现点击时间的响应。

    }

    private class MyClickListener implements OnClickListener{

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            callNumber();

        }

    }

    @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;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private void callNumber() {
        Intent intent=new Intent();

        String number=et.getText().toString().trim();

        if (TextUtils.isEmpty(number)) {
            Toast.makeText(MainActivity.this, "电话号码不能为空！", 0).show();
            return;
        }

        intent.setAction(Intent.ACTION_CALL);
        intent.setData(Uri.parse("tel:"+number));

        startActivity(intent);
    }
}

2、通过new一个匿名内部类类实现：

package com.example.dailcall;

import android.support.v7.app.ActionBarActivity;
import android.text.TextUtils;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;//创建 OnClickListener接口的时候要导入这个包
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {

    // 定义组建
    private EditText et;
    private Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et=(EditText) findViewById(R.id.et_number); //通过findViewById来查找组建名，绑定到定义的组建变量。
        btn=(Button) findViewById(R.id.btn_dail);
        btn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                callNumber();
            }
        });

    }

    @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;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private void callNumber() {
        Intent intent=new Intent();

        String number=et.getText().toString().trim();

        if (TextUtils.isEmpty(number)) {
            Toast.makeText(MainActivity.this, "电话号码不能为空！", 0).show();
            return;
        }

        intent.setAction(Intent.ACTION_CALL);
        intent.setData(Uri.parse("tel:"+number));

        startActivity(intent);
    }
}

3、让MainActivity来实现点击时间的借口

package com.example.dailcall;

import android.support.v7.app.ActionBarActivity;
import android.text.TextUtils;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;//创建 OnClickListener接口的时候要导入这个包
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Switch;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity implements OnClickListener {

    // 定义组建
    private EditText et;
    private Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et=(EditText) findViewById(R.id.et_number); //通过findViewById来查找组建名，绑定到定义的组建变量。
        btn=(Button) findViewById(R.id.btn_dail);
        btn.setOnClickListener(this);

    }

    @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;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private void callNumber() {

        Intent intent=new Intent();
        String number=et.getText().toString().trim();
        if (TextUtils.isEmpty(number)) {
            Toast.makeText(MainActivity.this, "电话号码不能为空！", 0).show();
            return;
        }

        intent.setAction(Intent.ACTION_CALL);
        intent.setData(Uri.parse("tel:"+number));

        startActivity(intent);
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {
        case R.id.btn_dail:

            callNumber();
            break;

        default:
            break;
        }
    }
}

4、在布局文件中button的按钮里边定义一个onclick的属性：

package com.example.dailcall;

import android.support.v7.app.ActionBarActivity;
import android.text.TextUtils;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;//创建 OnClickListener接口的时候要导入这个包
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {

    // 定义组建
    private EditText et;
    private Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et=(EditText) findViewById(R.id.et_number); //通过findViewById来查找组建名，绑定到定义的组建变量。
        btn=(Button) findViewById(R.id.btn_dail);

    }

    public void btndail(View view){
        callNumber();
    }

    @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;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private void callNumber() {
        Intent intent=new Intent();

        String number=et.getText().toString().trim();

        if (TextUtils.isEmpty(number)) {
            Toast.makeText(MainActivity.this, "电话号码不能为空！", 0).show();
            return;
        }

        intent.setAction(Intent.ACTION_CALL);
        intent.setData(Uri.parse("tel:"+number));

        startActivity(intent);
    }
}

其中button的定义文件为：

   <Button
        android:onClick="btndail"
        android:id="@+id/btn_dail"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/et_number"
        android:text="@string/dail" />