startActivityForResult ,onActivityResult,Activity之间传数据

AndroidManifest.xml
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".KakuLogerActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
       
        <activity android:name=".LaunchActivity"
                  android:label="@string/app_name2" >
        </activity>
    </application>

主Activity：
public class KakuLogerActivity extends Activity {
   
    TextView phoneNumber;
    EditText iNameField;
    int REQUEST_CODE = 0;
   
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button launchBtn = (Button)findViewById(R.id.btnLaunchActivity);
        iNameField = (EditText)findViewById(R.id.inamefield);
        phoneNumber = (TextView)findViewById(R.id.phone_number);

        launchBtn.setOnClickListener(new OnClickListener(){
            @Override 
            public void onClick(View v) { 
                Intent newIntent = new Intent(KakuLogerActivity.this, LaunchActivity.class);
                // 传递参数
newIntent.putExtra("name", iNameField.getText().toString());
                // 开始一个新的 Activity等候返回结果
               startActivityForResult(newIntent, REQUEST_CODE);
                Log.i("clicked", "open the LaunchActivity page!!!!");
            }
        });
    }

    @Override
    // 当结果返回后判断并执行操作
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        super.onActivityResult(requestCode, resultCode, intent);
        if (requestCode == REQUEST_CODE) {
            if (resultCode == RESULT_OK) {
               Bundle extras = intent.getExtras();
                if (extras != null) {
                    phoneNumber.setText("Phone #: "
                            + extras.getString("phonenumber"));
                }
            }
        }
    }
}
LaunchActivity：
public class LaunchActivity extends Activity {
   
    EditText phoneNumber;
   
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
       
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout2);
        Button btn = (Button)findViewById(R.id.btnRtrnActivity);
        TextView oNameField = (TextView)findViewById(R.id.oNameMessege);
        phoneNumber = (EditText)findViewById(R.id.iTelephoneField);
        Log.i("launchActivity", "opened the LaunchActivity page!!!!");
        // 取得前一个画面的传入值
        Bundle extras = getIntent().getExtras();
        oNameField.setText("Hello " + extras.getString("name"));

        btn.setOnClickListener(new OnClickListener(){ 
            public void onClick(View v) {
                // 设置返回数据
                Bundle bundle = new Bundle();
bundle.putString("phonenumber", phoneNumber.getText().toString());
                Intent intent = new Intent();
                intent.putExtras(bundle);
                // 返回intent
                setResult(RESULT_OK, intent);
                finish();
            }
        });
    }
}

 

传递Uri时候，可以使用toString将其转化为String类型，在onActivityResult中使用Uri uri = Uri.Parse(String string) 转化为Uri类型。不建议Activity之间传递一个Class或结构体,因为Activity之间传递的速度非常慢，最好只传一些基本数据类型。