Android页面的跳转及传值

(1)使用Intent跳转页面

第一个activity:

Intent myIntent = new Intent();    
myIntent.putExtra("myText", myTextView.getText());
myIntent.setClass(MainActivity.this, Activity2.class);
startActivity(myIntent);

第二个activity:

//从MainActiviry中跳转到这个Activity中利用Intent传递数据。
//获取Intent
Intent intent = getIntent(); 
String text  = intent.getStringExtra("myText");
textview2 = (TextView)findViewById(R.id.textView1); 
textview2.setText(text);

(2)点击按钮或者链接，打开一个网站

myBtn2.setOnClickListener(new OnClickListener(){
    @Override
    public void onClick(View v) {
        //访问网页。
        Uri uri = Uri.parse("http://www.baidu.com");
        Intent intent = new Intent(Intent.ACTION_VIEW,uri);
        startActivity(intent); 
    }
 });

(3)使用Bundle传递参数

源Activity中：MainActivity.java

BundleBtn.setOnClickListener(new OnClickListener(){
    @Override
    public void onClick(View v) {
        //使用Bundle传递参数
        Intent myIntent = new Intent();
        Bundle bundle = new Bundle();
        bundle.putString("info",myEditText.getText().toString());
        myIntent.putExtras(bundle);
        myIntent.setClass(MainActivity.this, Activity3Bundle.class);
        startActivity(myIntent);
    }
});

目标Activity:Activity3Bundle.java

public class Activity3Bundle extends Activity {
    private TextView textView3;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
         setContentView(R.layout.activity3);

        textView3 = (TextView)findViewById(R.id.textView3);
        Bundle myBundle = this.getIntent().getExtras();
        String myText  = myBundle.getString("info");
        textView3.setText(myText);

    }
}

(4)跳转后返回

使用Bundle传递参数，第一个Activity点击一个按钮，跳转到第二个页面。第二个页面输入一个内容，点击按钮，返回第一个Activity,并将第二个Activity中输入的内容显示在第一个Activity中。

第一个Activity代码：

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {
    private TextView myTextView;
    private Button ZhuceBtn;
    private final static int REQUESTCODE = 1;//返回的结果码

    //Intent
    private Intent MyIntent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         myTextView = (TextView)findViewById(R.id.textView1);
        ZhuceBtn = (Button)findViewById(R.id.buttonzhuce);

        //使用Intent向另一个Activity发送请求，使用Bundle返回参数
        ZhuceBtn.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                MyIntent = new Intent();
                MyIntent.setClass(MainActivity.this, Activity3Bundle.class);
                startActivityForResult(MyIntent,REQUESTCODE);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode,int resultCode,Intent data) {
            // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode==REQUESTCODE){
            if(resultCode==2){
                setTitle("Cancel****");
            }else 
                if(resultCode==1){
//              String  Name=data.getStringExtra("username");
                Bundle bundle = data.getExtras();
                String Name = bundle.getString("username");
                myTextView.setText("恭喜您，注册成功。您的用户名是："+Name);
            }
        }
    }


}

第二个Activity:

public class Activity3Bundle extends Activity {
    private Button zhuceBtn;
    private EditText zhuceEdit;
    private Button buttonCancle;//取消按钮

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity3);

        zhuceEdit = (EditText)findViewById(R.id.editTextzhuce);
        zhuceBtn = (Button)findViewById(R.id.buttonzhuce);
        buttonCancle = (Button)findViewById(R.id.buttonCancle);

        zhuceBtn.setOnClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View v) {
                //将参数传回请求的Activity
                Intent zhuceIntent = new Intent();
                Bundle myBundle = new Bundle();
                myBundle.putString("username", zhuceEdit.getText().toString());
                //zhuceIntent.putExtra("username", zhuceEdit.getText().toString());
                zhuceIntent.putExtras(myBundle);
                setResult(1,zhuceIntent);
                finish();
            }
        });

        buttonCancle.setOnClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View v) {
                //将参数传回请求的Activity
                Intent zhuceIntent = new Intent();
                setResult(2,zhuceIntent);
                finish();
            }
        });
    }
}

(5)传递对象

放入对象

intent.putExtra("user", user);

或

Bundle mBundle = new Bundle();
mBundle.putSerializable("user",user);
intent.putExtras(mBundle);

取出对象

User user = (User) getIntent().getSerializableExtra("user");

其中User对象要implements Serializable