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本帖最后由 alltolove 于 2017-9-19 08:02 编辑
first_layout.xml里新添加个按钮和文本控件- <Button
- android:id="@+id/button_4"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:text="button_4" />
- <TextView
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:id="@+id/text"
- />
复制代码
把mainactivity.java文件修改为- 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.TextView;
- 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);
- intent.putExtra("extra_data","hello activity1");
- startActivity(intent);
- }
- });
- Button button4=(Button)findViewById(R.id.button_4);
- button4.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View view) {
- Intent intent1=new Intent(MainActivity.this,SecondActivity.class);
- startActivityForResult(intent1,1);
- }
- });
- }
- @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);
- }
- @Override
- protected void onActivityResult(int requestCode, int resultCode, Intent data) {
- super.onActivityResult(requestCode, resultCode, data);
- switch(requestCode){
- case 1:if(resultCode==RESULT_OK){
- String result=data.getStringExtra("data_return");
- TextView text =(TextView)findViewById(R.id.text);
- text.setText(result);
- }
- break;
- default:
- }
- }
- void myClick(View v){
- Toast.makeText(this, "这是我的方法", Toast.LENGTH_SHORT).show();
- }
- }
复制代码
把secondactivity.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.View;
- import android.widget.Button;
- import android.widget.TextView;
- 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) {
- Intent intent1=getIntent();
- intent1.putExtra("data_return","hello firstactivity");
- setResult(RESULT_OK,intent1);
- finish();
- }
- });
- Button btn1 = (Button)findViewById(R.id.btn1);
- btn1.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View view) {
- Intent intent = new Intent();
- intent.setAction(Intent.ACTION_DIAL);
- startActivity(intent);
- }
- });
- TextView text=(TextView)findViewById(R.id.text1);
- Intent intent1=getIntent();
- String string1 = intent1.getStringExtra("extra_data");
- text.setText(string1);
- }
- }
复制代码
效果图:
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