andorid入门项目

package mars.helloworld; import android.app.Activity; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; public class HelloActivity extends Activity { /** Called when the activity is first created. */ private TextView one_text; private Button button1 = null; private Button button2 = null; private Button button3 = null; private int n = 0; private Intent intent = null; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); one_text = (TextView) findViewById(R.id.text_id); button1 = (Button) findViewById(R.id.button1); button2 = (Button) findViewById(R.id.button2); button3 = (Button) findViewById(R.id.button3); one_text.setText("用于显示的文本"); button1.setText("点击"); // button1.setBackgroundColor(200); this.setVolumeControlStream(R.drawable.laonanhai); // 添加背景音乐 intent = new Intent("com.angel.Android.MUSIC"); this.startService(intent); button1.setOnClickListener(new MyButtonListener()); button2.setOnClickListener(new MyButtonListener()); button3.setOnClickListener(new MyButtonListener()); } class MyButtonListener implements OnClickListener { @Override public void onClick(View v) { if (v == button1) { if ("点击".equals(button1.getText())) { button1.setText("恢复"); } else { button1.setText("点击"); } one_text.setText("按钮被单击" + (++n) + "次"); } else if (v == button2) { intent = new Intent(); intent.putExtra("username", "zlp"); intent.setClass(HelloActivity.this, OtherActivity.class); startActivity(intent); } else if (v == button3) { intent = new Intent(); Uri smsToUri = Uri.parse("smsto://15004168581"); intent = new Intent(Intent.ACTION_SENDTO, smsToUri); intent.putExtra("sms_body", "shenrenkui"); // intent.setClass(HelloActivity.this, OtherActivity.class); startActivity(intent); } } } }