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先在主activity文件旁边再新建个文件,方法是,目录上点鼠标右键然后new->activity->empty activity起文件名为SecondActivity,文件代码如下:
- package com.example.xinwei.test;
- import android.support.v7.app.AppCompatActivity;
- import android.os.Bundle;
- import android.view.View;
- import android.widget.Button;
- public class SecondActivity extends AppCompatActivity {
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_second);
- Button btn =(Button)findViewById(R.id.btn);
- btn.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View view) {
- finish();
- }
- });
- }
- }
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再打开layout目录下的activity_second.xml文件,修改代码为:
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout
- xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_height="match_parent"
- android:layout_width="match_parent">
- <Button
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:text="@string/button_name"
- android:id="@+id/btn"/>
- </LinearLayout>
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然后打开values目录下strings.xml文件修改为:
- <resources>
- <string name="app_name">Test</string>
- <string name="m_titlename">Add</string>
- <string name="m_remove">Remove</string>
- <string name="button_name">Finish</string>
- </resources>
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然后再frist_layout.xml文件下再添加个按钮:
- <Button
- android:id="@+id/button_3"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:text="button_3"
- ></Button>
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把主文件MainActivity.java修改为:
- package com.example.xinwei.test;
- import android.content.Intent;
- import android.support.v7.app.AppCompatActivity;
- import android.os.Bundle;
- import android.view.Menu;
- import android.view.MenuItem;
- import android.view.View;
- import android.widget.Button;
- import android.widget.Toast;
- public class MainActivity extends AppCompatActivity {
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.first_layout);
- Button button1=(Button)findViewById(R.id.button_1);
- button1.setOnClickListener(new View.OnClickListener(){
- @Override
- public void onClick(View view) {
- Toast.makeText(MainActivity.this, "you clicked button1", Toast.LENGTH_SHORT).show();
- }
- });
- Button button3=(Button)findViewById(R.id.button_3);
- button3.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View view) {
- Intent intent = new Intent(MainActivity.this,SecondActivity.class);
- startActivity(intent);
- }
- });
- }
- @Override
- public boolean onCreateOptionsMenu(Menu menu){
- getMenuInflater().inflate(R.menu.main,menu);
- return true;
- }
- @Override
- public boolean onOptionsItemSelected(MenuItem item) {
- switch (item.getItemId()){
- case R.id.add_item:
- Toast.makeText(this, "You clicked add", Toast.LENGTH_SHORT).show();
- break;
- case R.id.remove_item:
- Toast.makeText(this, "You clicked remove", Toast.LENGTH_SHORT).show();
- break;
- default:
- }
- return super.onOptionsItemSelected(item);
- }
- void myClick(View v){
- Toast.makeText(this, "这是我的方法", Toast.LENGTH_SHORT).show();
- }
- }
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打开虚拟机运行程序,点击第三个按钮就会弹出第二个活动了,效果图:
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