Android中Activity的跳轉

1、創建工程

2、添加代碼

1. package com.example.helloworld;
2. import android.app.Activity; import android.content.Intent;
3. import android.os.Bundle; import android.view.View;
4. import android.view.View.OnClickListener; import android.widget.Button;
5.  
6. public class MainActivity extends Activity {
7. private Button button; @Override
8. protected void onCreate(Bundle savedInstanceState) {
9. super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);
10. this.button = (Button) this.findViewById(R.id.button1);
11. this.button.setOnClickListener(new OnClickListener() { @Override
12. public void onClick(View v) { Intent intent = new Intent();
13. intent.setClass(MainActivity.this, IntentActivity.class); intent.putExtra(name, Hello World);
14. startActivity(intent); }
15. }); }
16. }

    package com.example.helloworld;
    
    import android.app.Activity;
    import android.content.Intent;
    import android.os.Bundle;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    
    
    public class MainActivity extends Activity 
    {
        private Button button;
    	@Override
    	protected void onCreate(Bundle savedInstanceState)
    	{
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_main);
    		
    		   this.button = (Button) this.findViewById(R.id.button1);
    	        this.button.setOnClickListener(new OnClickListener() {
    	            @Override
    	            public void onClick(View v) {
    	                Intent intent = new Intent();
    	                intent.setClass(MainActivity.this, IntentActivity.class);
    	                intent.putExtra(name, Hello World);
    	                startActivity(intent);
    	            }
    	        });	
    	}	
    }

    
    在添加代碼之前，先在res/layout/activity_main.xml中，拖拽一個Button控件上去。此時會自動在activity_main.xml中生成Button的信息，注意id值，如果使用此Button，有用

    3、添加跳轉Activity

    1、右擊src/com.example.helloworld，new->class，在name處填寫IntentActivity，不用加java即可 2、添加layout。在res/layout處右擊，new->android XML file，在此xml上拖拽一個TextView上去。此時在R.java中自動添加了TextView的地址 3、在AndroidManifest.xml中添加如下代碼：完成Activity的注冊 [java] 

    1. 4、實現IntentActivity.java [java] view plaincopyprint?
       1. package com.example.helloworld;
       2. import android.app.Activity; import android.os.Bundle;
       3. import android.widget.TextView; import android.content.Intent;
       4. public class IntentActivity extends Activity {
       5. @Override protected void onCreate(Bundle savedInstanceState)
       6. { super.onCreate(savedInstanceState);
       7. setContentView(R.layout.activity_intent); Intent intent = getIntent();
       8. String string = intent.getStringExtra(name);
       9. TextView textView = new TextView(this); textView.setTextSize(40);
       10. textView.setText(string);
       11. setContentView(textView); }
       12. }

           package com.example.helloworld;
           
           import android.app.Activity;
           import android.os.Bundle;
           import android.widget.TextView;
           import android.content.Intent;
           public class IntentActivity extends Activity
           {
           	@Override
           	protected void onCreate(Bundle savedInstanceState)
           	{
           		super.onCreate(savedInstanceState);
           		setContentView(R.layout.activity_intent);
           		Intent intent = getIntent();
           		String string = intent.getStringExtra(name);
           
           		TextView textView = new TextView(this);
           		textView.setTextSize(40);
           		textView.setText(string);
           		
           		setContentView(textView);
           	}
           }

           
           

           4、運行

           打開模擬器或者手機，運行。