首先看结构 这个结构由三部分组成:
startActivityForResult
onActivityResult()
setResult()
这个三个函数构成
具体的参数就不写了 应该能知道。
注意的是调用setResult之后必须调用finish()不然的话 是不会跳转的
调用setResult的时候直接调用即将回跳的函数的
onActivityResult() 然后在调用该函数的onrestart onstart onresume 如果你在每个setResult后下finish方法 那么该activity直接调用destory方法。
第一个activity
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.v("startforrequest", "onCreate:"+this.getLocalClassName());
Button bt=(Button)findViewById(R.id.bt);
bt.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent(StartForResultTest.this,StartForResultTest1.class);
startActivityForResult(intent, 0);
}});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
Log.v("startforrequest", "onActivityResult: "+requestCode+" : "+resultCode);
}
第二个activity
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main1);
Log.v("startforrequest", "onCreate:"+this.getLocalClassName());
Button bt=(Button)findViewById(R.id.bt);
bt.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent(StartForResultTest1.this,StartForResultTest2.class);
startActivityForResult(intent, 1);
}});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
Intent intent=new Intent(this,StartForResultTest.class);
setResult(1, intent);
finish();
Log.v("startforrequest", "onActivityResult: "+requestCode+" : "+resultCode);
}
第三个也就是最后一个activity
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main2);
Log.v("startforrequest", "onCreate:"+this.getLocalClassName());
Button bt=(Button)findViewById(R.id.bt);
bt.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent(StartForResultTest2.this,StartForResultTest1.class);
setResult(2, intent);
finish();
}});
}
那么当跳转到最后一个的时候 回直接调回第一个activity 调用restart start resume方法之后
再destory 最后一个 倒数第二个..
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
startActivityForResult Demo
startActivityForResult(Itent intent, int requestCode)用来唤起一个Activity。利用这个方法,前一个Activity1便会有一个等待次Activity2的返回,返回时响应onActivityResult(int requestCode, int resultCode, Intent data)方法。
Demo如下:
第一个activity
- package com.kevin.intent;
- import android.app.Activity;
- import android.content.Intent;
- import android.os.Bundle;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.widget.Button;
- import android.widget.EditText;
- public class Main extends Activity implements OnClickListener{
- private Button btn_transfer;
- private EditText et_name;
- private int requestCode = 1;
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- btn_transfer = (Button) findViewById(R.id.button1);
- et_name = (EditText) findViewById(R.id.editText1);
- btn_transfer.setOnClickListener(this);
- }
- @Override
- protected void onActivityResult(int requestCode, int resultCode, Intent data) {
- System.out.println("requestCode--->" + requestCode);
- // resultCode是第二个Activity返回过来的值
- switch (resultCode) {
- case RESULT_OK:
- // 获取Bundle对象
- Bundle returnedBundle = data.getExtras();
- String returnedName = returnedBundle.getString("name");
- et_name.setText(returnedName);
- break;
- default:
- break;
- }
- }
- @Override
- public void onClick(View v) {
- // 取得et_name的值
- String name = et_name.getText().toString();
- Bundle bundle = new Bundle();
- bundle.putString("name", name);
- Intent intent = new Intent();
- intent.setClass(this, Activity_1.class);
- intent.putExtras(bundle);
- // 启动Activity_1
- startActivityForResult(intent, requestCode);
- }
- }
package com.kevin.intent; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; public class Main extends Activity implements OnClickListener{ private Button btn_transfer; private EditText et_name; private int requestCode = 1; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btn_transfer = (Button) findViewById(R.id.button1); et_name = (EditText) findViewById(R.id.editText1); btn_transfer.setOnClickListener(this); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { System.out.println("requestCode--->" + requestCode); // resultCode是第二个Activity返回过来的值 switch (resultCode) { case RESULT_OK: // 获取Bundle对象 Bundle returnedBundle = data.getExtras(); String returnedName = returnedBundle.getString("name"); et_name.setText(returnedName); break; default: break; } } @Override public void onClick(View v) { // 取得et_name的值 String name = et_name.getText().toString(); Bundle bundle = new Bundle(); bundle.putString("name", name); Intent intent = new Intent(); intent.setClass(this, Activity_1.class); intent.putExtras(bundle); // 启动Activity_1 startActivityForResult(intent, requestCode); } }
跳转后的activity
- package com.kevin.intent;
- import android.app.Activity;
- import android.content.Intent;
- import android.os.Bundle;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.widget.Button;
- import android.widget.TextView;
- public class Activity_1 extends Activity implements OnClickListener{
- private Button btn_return;
- private TextView textView;
- private Intent intent;
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity1);
- intent = this.getIntent();
- Bundle bundle = intent.getExtras();
- String name = bundle.getString("name");
- System.out.println("name --- >" + name);
- textView = (TextView) findViewById(R.id.tv_receivedname);
- textView.setText("传过来的name值为: " + name);
- btn_return = (Button) findViewById(R.id.btn_return);
- btn_return.setOnClickListener(this);
- }
- @Override
- public void onClick(View v) {
- // 点击返回按钮后,设置返回值
- setResult(RESULT_OK, intent);
- this.finish();
- }
- }
package com.kevin.intent; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; public class Activity_1 extends Activity implements OnClickListener{ private Button btn_return; private TextView textView; private Intent intent; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity1); intent = this.getIntent(); Bundle bundle = intent.getExtras(); String name = bundle.getString("name"); System.out.println("name --- >" + name); textView = (TextView) findViewById(R.id.tv_receivedname); textView.setText("传过来的name值为: " + name); btn_return = (Button) findViewById(R.id.btn_return); btn_return.setOnClickListener(this); } @Override public void onClick(View v) { // 点击返回按钮后,设置返回值 setResult(RESULT_OK, intent); this.finish(); } }