第一行代码 -2- 探究活动 - MKT-porter

注意修改名字

<Button 
    
    android:id="@+id/button1"
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    android:text="按钮1"
    
    />

public class FirstActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.first_layout);
    }
}

//空项目会自动生成，这是主启动，现在需要手动添加
        <activity android:name=".FirstActivity"
                     android:label="这是第一个活动"  >

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

        </activity>

public class FirstActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.first_layout);
//新添加的
        Button button1=(Button)findViewById(R.id.button1);
        button1.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v){
            Toast.makeText(FirstActivity.this,"你点击了按钮1",Toast.LENGTH_SHORT).show();
           }
        });


    }
}

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/add_item"
        android:title="Add"
        />
    <item
        android:id="@+id/remove_item"
        android:title="Remove"
        />

</menu>

  public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main,menu);
        return true;
    }

@Override  //  重写菜单触发事件
     public boolean onOptionsItemSelected(MenuItem item) {

        switch(item.getItemId()) {
            case R.id.add_item:
                Toast.makeText(FirstActivity.this, "你点击了创建按钮", Toast.LENGTH_SHORT).show();
                break;
            case R.id.remove_item:
                Toast.makeText(FirstActivity.this, "你点击了移除按钮", Toast.LENGTH_SHORT).show();
                break;
            default:
        }
        return true;
    }

最终代码

package com.example.student.activitytest;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class FirstActivity extends AppCompatActivity {

    @Override //重写创建菜单事件
    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.main,menu);
        return true;
    }

    @Override // 主界面初始构造函数
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.first_layout);

        Button button1=(Button)findViewById(R.id.button1);
        button1.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v){
            Toast.makeText(FirstActivity.this,"你点击了按钮1",Toast.LENGTH_SHORT).show();
        }
        });
    }

    @Override  //  重写菜单触发事件
     public boolean onOptionsItemSelected(MenuItem item) {

        switch(item.getItemId()) {
            case R.id.add_item:
                Toast.makeText(FirstActivity.this, "你点击了创建按钮", Toast.LENGTH_SHORT).show();
                break;
            case R.id.remove_item:
                Toast.makeText(FirstActivity.this, "你点击了移除按钮", Toast.LENGTH_SHORT).show();
                break;
            default:
        }
        return true;
    }
}

如何销毁一个活动

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <Button
        android:id="@+id/button2"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:text="按钮2"
        />
</LinearLayout>

 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second_layout);
  
    }

 public void onClick(View v){
       Toast.makeText(FirstActivity.this,"你点击了按钮1,准备切换活动2",Toast.LENGTH_SHORT).show();

       Intent intent=new Intent(FirstActivity.this,second_layout.class);
       startActivity(intent);
       
    // finish();
               }
             });
    }

<activity android:name=".second_layout">
<intent-filter> 
    <action android:name="com.example.activitytest.ACTION_START" />                
    <category android:name="android.intent.category.DEFAULT" />   
</intent-filter>    
</activity>

 public void onClick(View v){
       Toast.makeText(FirstActivity.this,"你点击了按钮1,准备切换活动2",Toast.LENGTH_SHORT).show();

      // Intent intent=new Intent(FirstActivity.this,second_layout.class);
       Intent intent=new Intent("com.example.activitytest.ACTION_START");
       startActivity(intent);

    // finish();
               }
             });
    }

public void onClick(View v){
    Toast.makeText(FirstActivity.this,"你点击了按钮1,准备切换活动2",Toast.LENGTH_SHORT).show();

// Intent intent=new Intent(FirstActivity.this,SecondActivity .class); //显式调用
 Intent intent=new Intent("com.example.activitytest.ACTION_START");//隐士调用1+默认
 intent.addCategory("com.example.activitytest.MY_CATEGORY");//隐士调用2+增加一个自定义
 startActivity(intent);


            }
          });
 }

<activity android:name=".second_layout">
        <intent-filter> 
            <action android:name="com.example.activitytest.ACTION_START" />                
            <category android:name="android.intent.category.DEFAULT" />  
            <category android:name="com.example.activitytest.MY_CATEGORY" />    
        </intent-filter>    
        </activity>

 button1.setOnClickListener(new View.OnClickListener(){
   @Override
   public void onClick(View v){
       Toast.makeText(FirstActivity.this,"你点击了按钮1,准备切换活动2",Toast.LENGTH_SHORT).show();
       // 显式
       // Intent intent=new Intent(FirstActivity.this,second_layout.class);
       //隐式
       //  Intent intent=new Intent("com.example.activitytest.ACTION_START");
       // intent.addCategory("com.example.activitytest.MY_CATEGORY");
       // 开启别的程序-网页
       Intent intent=new Intent("android.intent.action.VIEW");
       intent.setData(Uri.parse("http://www.baidu.com"));
       startActivity(intent);

               }
             });
    }

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <Button
        android:id="@+id/button3"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:text="按钮3"
        />
</LinearLayout>

修改后

 <activity android:name=".ThirdActivity">
 <intent-filter>
     <action android:name="android.intent.action.VIEW" />
     <category android:name="android.intent.category.DEFAULT" />
     <data android:scheme="http" />
 </intent-filter>
</activity>

按键代码：

  Button button1=(Button)findViewById(R.id.button1);
        button1.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v){
            Toast.makeText(FirstActivity.this,"你点击了按钮1",Toast.LENGTH_SHORT).show();

           // Intent intent=new Intent(FirstActivity.this,SecondActivity .class); //显式调用
          //  Intent intent=new Intent("com.example.activitytest.ACTION_START");//隐士调用1+默认
         //   intent.addCategory("com.example.activitytest.MY_CATEGORY");//隐士调用2+增加一个自定义

         //   Intent intent=new Intent("android.intent.action.VIEW"); // 网页测试
        //    intent.setData(Uri.parse("http://www.baidu.com"));

            Intent intent=new Intent(Intent.ACTION_DIAL);
            intent.setData(Uri.parse("tel:10086"));
            startActivity(intent);


        }
        });
    }

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posted on 2018-06-12 15:50 MKT-porter 阅读(125) 评论(0) 收藏举报

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