Android——Intent,Bundle

• Intent——切换activity
  

  intent.setClass(first.this,second.class);
  startActivity(intent);

• Bundle——切换时数据传递
  

  //跳转
  Intent intent = new Intent();
  //跳转时数据传输
  Bundle bundle = new Bundle();
  intent.setClass(MainActivity.this, SecondActivity.class);
  bundle.putString("message", str);
  intent.putExtras(bundle);
  startActivity(intent);

  Bundle bundle = this.getIntent().getExtras();
  String message = bundle.getString("message");

 

 

Source Code:

package com.example.intent;

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

public class MainActivity extends Activity {
    
    private EditText myText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        Button button = (Button)findViewById(R.id.button1);
        myText = (EditText)findViewById(R.id.editText1);
        
        button.setOnClickListener(new OnClickListener() {
            @Override 
            public void onClick(View v) {
                
                String str = myText.getText().toString();
                //跳转
                Intent intent = new Intent();
                //跳转时数据传输
                Bundle bundle = new Bundle();
                
                intent.setClass(MainActivity.this, SecondActivity.class);
                bundle.putString("message", str);
                intent.putExtras(bundle);
                
                
                startActivity(intent);
                
            }
        });
        
        
    }

    
}

MainActiviy.java