package com.example.myapp;import android.app.Activity;import android.content.DialogInterface;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;public class MyActivity extends Activity {    private Button btnOk = null;    /**     * Called when the activity is first created.     */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        btnOk = (Button)findViewById(R.id.btnCallOther);        btnOk.setOnClickListener(new MyButtonListener());    }    class MyButtonListener implements View.OnClickListener {        @Override        public void onClick(View view) {            Intent intent = new Intent();            intent.putExtra("key","value");            intent.setClass(MyActivity.this,otherActivity.class);            MyActivity.this.startActivity(intent);        }    }}

package com.example.myapp;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.widget.TextView;/** * Created by chang on 14-9-17. */public class otherActivity extends Activity{    private TextView tv = null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.other);        Intent intent = getIntent();        String s = intent.getStringExtra("key");        tv = (TextView)findViewById(R.id.otherTextView);        tv.setText(s);    }}