Activity之间传递数据（一）传递简单类型数据

package com.example.wjb.myapplication;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {

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

        Button btn = (Button) findViewById(R.id.button);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(MainActivity.this, Act.class);
                i.putExtra("data", "Hello world");
                startActivity(i);
            }
        });
    }

}

package com.example.wjb.myapplication;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

/**
 * Created by wjb on 2015/9/2.
 */
public class Act extends Activity{

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

        TextView tv= (TextView) findViewById(R.id.textView);
        Intent i = getIntent();
        tv.setText(i.getStringExtra("data"));
    }
}