Android组件之间交互核心Intent用法分析

Intent intent = new Intent(Main.this, SecondActivity.class);
startActivity(intent);

startActivityForResult(Intent intent, Int requestCode)

public class MainActivity extends Activity {
  /** Called when the activity is first created. */
   @Override
    public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      //给按钮添加绑定的事件
      Button myButton = (Button)findViewById(R.id.myButton);
      myButton.setText("我的第一个Button");
      myButton.setOnClickListener(new OnClick());
    }
   @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    System.out.println(requestCode);
    System.out.println(resultCode);
  }
   public class OnClick implements OnClickListener{
      @Override
      public void onClick(View v) {
        //生成一个Intent对象
        Intent intent = new Intent();
        intent.putExtra("testIntent", "testExtra");
        intent.setClass(MainActivity.this,SecondActivity.class);
        //直接启动一个Activity
//       startActivity(intent);
        //启动一个有返回值的Activity
        startActivityForResult(intent, 2);
      }
    }
}

public class SecondActivity extends Activity{
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    this.setContentView(R.layout.other);
    Button btn = (Button)findViewById(R.id.otherButton);
    btn.setOnClickListener(new Button.OnClickListener(){
      @Override
      public void onClick(View v) {
        Intent intent = getIntent();
        setResult(3, intent);
        finish();
      }
    });
  }
}

myActionBtn.setOnClickListener(new Button.OnClickListener(){
  @Override
  public void onClick(View v) {
    System.out.println("myActionBtn");
//         Intent intent = getIntent();
// 这里一定要new一个Intent对象，如果用上面的则打开的是当前的Activity
    Intent intent = new Intent();
    intent.setAction(MY_ACTION);
    startActivity(intent);
  }
});

<activity android:name=".SecondActivity" android:label="@string/secondActivity">
  <intent-filter>
    <action android:name="hb.com.MY_ACTION" />
    <category android:name="android.intent.category.DEFAULT" />
  </intent-filter>
</activity>

//显示_id为1的联系人信息
data = "content://contacts/people/1";
uri = Uri.parse(data);
//ACTION_VIEW显示数据给用户
intent.setAction(Intent.ACTION_VIEW);
intent.setData(uri);
startActivity(intent);
//编辑_id为1的联系人信息
data = "content://contacts/people/1";
uri = Uri.parse(data);
//ACTION_EDIT显示可编辑数据
intent.setAction(Intent.ACTION_EDIT);
intent.setData(uri);
startActivity(intent);
//显示拨打电话的界面
data = "tel:13811111111";
uri = Uri.parse(data);
//ACTION_DIAL显示拨打电话的面板
intent.setAction(Intent.ACTION_DIAL);
intent.setData(uri);
startActivity(intent);
//直接拨打电话
data = "tel:13811111111";
uri = Uri.parse(data);
//ACTION_CALL直接打电话
intent.setAction(Intent.ACTION_CALL);
intent.setData(uri);
startActivity(intent);
//访问浏览器
data = "http://www.baidu.com";
uri = Uri.parse(data);
//ACTION_VIEW显示数据给用户
intent.setAction(Intent.ACTION_VIEW);
intent.setData(uri);
startActivity(intent);
//访问地图
data = "geo://39.92,116.46";
uri = Uri.parse(data);
//ACTION_VIEW显示数据给用户
intent = new Intent(Intent.ACTION_VIEW,uri);
startActivity(intent);