• 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);                            }        });                    }    }

package com.example.intent;import android.app.Activity;import android.os.Bundle;import android.view.TextureView;import android.widget.TextView;public class SecondActivity extends Activity{        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.second);                Bundle bundle = this.getIntent().getExtras();        String message = bundle.getString("message");                TextView myText = (TextView)findViewById(R.id.textView2);        myText.setText(message);            }    }

      
          
       
        Intent
           
       
        Settings
           
       
        Hello world!
           
       
        TreeDream