首先定义一个LifeCycleActivity的类，继承Activity，重写onCreat() onStart() onResume() onPause() onStop() onDestroy()
1 import android.app.Activity;
2 import android.os.Bundle;
3 import android.util.Log;
4
5 public class LifeCycleActivity extends Activity{
6
7 @Override
8 protected void onCreate(Bundle savedInstanceState) {
9 super.onCreate(savedInstanceState);
10 Log.e(this.getClass().getName(), "onCreate");
11 }
12
13 @Override
14 protected void onStart() {
15 super.onStart();
16 Log.e(this.getClass().getName(), "onStart");
17 }
18
19 @Override
20 protected void onResume() {
21 super.onResume();
22 Log.e(this.getClass().getName(), "onResume");
23 }
24
25 @Override
26 protected void onPause() {
27 super.onPause();
28 Log.e(this.getClass().getName(), "onPause");
29 }
30
31 @Override
32 protected void onStop() {
33 super.onStop();
34 Log.e(this.getClass().getName(), "onStop");
35 }
36
37 @Override
38 protected void onDestroy() {
39 super.onDestroy();
40 Log.e(this.getClass().getName(), "onDestroy");
41 }
42 }
打开APP,并启动下一个界面，然后返回主界面
点击事件监听
一、自己点击自己
1 import android.content.Intent;
2 import android.os.Bundle;
3 import android.util.Log;
4 import android.view.View;
5 import android.view.View.OnClickListener;
6 import android.widget.Button;
7 import android.widget.Toast;
8
9 public class MainActivity extends LifeCycleActivity {
10
11 public static final String TAG = "MainActivity";
12 Button button,buttonNext,buttonMsg,buttonSex,buttonHeight,buttonBack;
13
14 public static final int SEX_SELECT = 1;
15 public static final int HEIGHT_SELECT = 2;
16
17 @Override
18 protected void onCreate(Bundle savedInstanceState) {
19 super.onCreate(savedInstanceState);
20 setContentView(R.layout.activity_main);
21
22 //自己点击自己
23 button = (Button) findViewById(R.id.main_btn);
24 button.setOnClickListener(new OnClickListener() {
25 @Override
26 public void onClick(View v) {
27 //定义一个意图,启动FirstActivity
28 Intent intent = new Intent(MainActivity.this, MainActivity.class);
29 Toast.makeText(MainActivity.this, "你点击了自己", Toast.LENGTH_SHORT).show();
30 startActivity(intent);
31 }
32 });
33
34 //启动下一个界面，不带参数
35 buttonNext = (Button) findViewById(R.id.main_btn_next);
36 buttonNext.setOnClickListener(new OnClickListener() {
37 @Override
38 public void onClick(View v) {
39 //定义一个意图,启动FirstActivity
40 Intent intent = new Intent(MainActivity.this, FirstActivity.class);
41 startActivity(intent);
42 }
43 });
44
45 //启动下一个界面，并传递参数给下一个界面，比如发送一个句话
46 buttonMsg = (Button)findViewById(R.id.main_btn_msg);
47 buttonMsg.setOnClickListener(new OnClickListener() {
48 @Override
49 public void onClick(View v) {
50 Intent intent = new Intent(MainActivity.this, SecondActivity.class);
51 intent.putExtra("msg", "我要送你一句话");
52 startActivity(intent);
53
54 }
55 });
56
57
58 //启动下一个界面，选择性别，并将选择结果返回显示在MainActivity中
59 buttonSex = (Button)findViewById(R.id.main_sex);
60 buttonSex.setOnClickListener(new OnClickListener() {
61 @Override
62 public void onClick(View v) {
63 Intent intent = new Intent(MainActivity.this, ThirdActivity.class);
64
65 startActivityForResult(intent, SEX_SELECT);
66 }
67 });
68
69 //启动下一个界面，输入身高，并将结果返回显示在MainActivity中
70 buttonHeight = (Button) findViewById(R.id.main_height);
71 buttonHeight.setOnClickListener(new OnClickListener() {
72 @Override
73 public void onClick(View v) {
74 Intent intent = new Intent(MainActivity.this, FourActivity.class);
75 startActivityForResult(intent, HEIGHT_SELECT);
76 }
77 });
78
79 //退出App
80 buttonBack = (Button) findViewById(R.id.main_btn_back);
81 buttonBack.setOnClickListener(new OnClickListener() {
82 @Override
83 public void onClick(View v) {
84 //主活动点击返回直接退出程序
85 finish();
86 }
87 });
88 }
89
90
91 @Override
92 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
93
94 switch (requestCode) {
95 case SEX_SELECT:
96 String sex;
97 if(resultCode == ThirdActivity.MAN_CODE){
98 sex = data.getStringExtra("sex_result");
99 Log.e(TAG, "sex = "+sex);//null
100 buttonSex.setText("选择了"+sex);
101 }else {
102 sex = data.getStringExtra("sex_result");
103 buttonSex.setText("选择了"+sex);
104 }
105 break;
106 case HEIGHT_SELECT:
107 int height;
108 if(resultCode == FourActivity.SUBMIT){
109 //必须给默认值
110 height = data.getIntExtra("height", -1);
111 buttonHeight.setText(height+"cm");
112 }
113 break;
114 default:
115 }
116 }
117
118 }
启动下一个界面，无数据传递，无返回数据，
1 import android.os.Bundle;
2 import android.view.View;
3 import android.view.View.OnClickListener;
4 import android.widget.Button;
5
6 public class FirstActivity extends LifeCycleActivity{
7
8 @Override
9 protected void onCreate(Bundle savedInstanceState) {
10 super.onCreate(savedInstanceState);
11 setContentView(R.layout.activity_first);
12
13 //关闭这个界面，会回到上一个界面
14 Button buttonBack = (Button)findViewById(R.id.first_btn_back);
15 buttonBack.setOnClickListener(new OnClickListener() {
16 @Override
17 public void onClick(View v) {
18 //返回到上一个界面
19 finish();
20 }
21 });
22
23 }
26 }
启动下一个界面，并传递参数给下一个界面，比如发送一个句话
1 import android.content.Intent;
2 import android.os.Bundle;
3 import android.view.View;
4 import android.view.View.OnClickListener;
5 import android.widget.Button;
6 import android.widget.TextView;
7
8 public class SecondActivity extends LifeCycleActivity {
9
10 TextView tv;
11
12 @Override
13 protected void onCreate(Bundle savedInstanceState) {
14 super.onCreate(savedInstanceState);
15 setContentView(R.layout.activity_second);
16 tv = (TextView) findViewById(R.id.text);
17
18 //获取意图
19 Intent intent = getIntent();
20 //通过键key获取数据值
21 String data = intent.getStringExtra("msg");
22
23 //显示接收到的数据
24 tv.setText("收到:"+data);
25
26 Button buttonBack = (Button)findViewById(R.id.second_btn_back);
27 buttonBack.setOnClickListener(new OnClickListener() {
28 @Override
29 public void onClick(View v) {
30 finish();
31 }
32 });
33 }
34
35
36 }
启动下一个界面，选择性别，并将选择结果返回显示在MainActivity中
1 import android.content.Intent;
2 import android.os.Bundle;
3 import android.view.View;
4 import android.view.View.OnClickListener;
5 import android.widget.Button;
6
7 public class ThirdActivity extends LifeCycleActivity implements OnClickListener{
8 public static final int MAN_CODE = 1;
9 public static final int WOMAN_CODE = 2;
10
11 Button man,woman;
12 Intent intent;
13 @Override
14 protected void onCreate(Bundle savedInstanceState) {
15 super.onCreate(savedInstanceState);
16 setContentView(R.layout.activity_third);
17
18
19 man = (Button) findViewById(R.id.man);
20 man.setOnClickListener(this);
21
22 woman = (Button) findViewById(R.id.woman);
23 woman.setOnClickListener(this);
24
25 }
26
27 @Override
28 public void onClick(View v) {
29 intent = new Intent();
30 switch (v.getId()) {
31 case R.id.man:
32 intent.putExtra("sex_result", "男");
33
34 setResult(MAN_CODE, intent);
35 finish();
36 break;
37 case R.id.woman:
38 intent.putExtra("sex_result", "女");
39 setResult(WOMAN_CODE, intent);
40 finish();
41 break;
42 default:
43 }
44 }
45 }
//启动下一个界面，输入身高，并将结果返回显示在MainActivity中
1 import android.content.Intent;
2 import android.os.Bundle;
3 import android.view.View;
4 import android.view.View.OnClickListener;
5 import android.widget.Button;
6 import android.widget.EditText;
7
8 public class FourActivity extends LifeCycleActivity implements OnClickListener{
9 Button submit,cancel;
10 EditText et;
11 @Override
12 protected void onCreate(Bundle savedInstanceState) {
13 super.onCreate(savedInstanceState);
14 setContentView(R.layout.activity_four);
15
16 submit = (Button) findViewById(R.id.four_submit);
17 cancel = (Button) findViewById(R.id.four_cancel);
18 et = (EditText) findViewById(R.id.four_edit);
19
20 submit.setOnClickListener(this);
21 cancel.setOnClickListener(this);
22 }
23
24 public static final int SUBMIT = 1;
25 public static final int CANCEL = 2;
26 @Override
27 public void onClick(View v) {
28 Intent intent = new Intent();
29 switch (v.getId()) {
30 case R.id.four_submit:
31 int height = Integer.parseInt(et.getText().toString());
32 intent.putExtra("height", height);
33 setResult(SUBMIT, intent);
34 finish();
35 break;
36 case R.id.four_cancel:
37 setResult(CANCEL);
38 finish();
39 break;
40 default:
41 break;
42 }
43
44 }
45 }
时间： 2025-01-15 04:24:03