跳转
1、显示跳转
4种方法
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public class AActivity extends AppCompatActivity { private Button ma; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_a); ma=findViewById(R.id.btn_a); ma.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //显式方法1 Intent intent=new Intent(AActivity.this,BActivity.class); startActivity(intent); /*显式跳转方法2 Intent intent=new Intent(); intent.setClass(AActivity.this,BActivity.class); startActivity(intent); */ /*显式跳转方法3 Intent intent=new Intent(); intent.setClassName(AActivity.this,"com.example.textview.jump.BActivity"); startActivity(intent); */ /*显式跳转方法4 Intent intent=new Intent(); intent.setComponent(new ComponentName(AActivity.this,"com.example.textview.jump.BActivity")); startActivity(intent); */ } }); }} |
数据传递
AActivity点击跳转后发送数据
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package com.example.textview.jump;import android.content.ComponentName;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;import androidx.annotation.Nullable;import androidx.appcompat.app.AppCompatActivity;import com.example.textview.R;public class AActivity extends AppCompatActivity { private Button ma; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_a); ma=findViewById(R.id.btn_a); ma.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //显式方法1 Intent intent=new Intent(AActivity.this,BActivity.class); //数值传递 Bundle bundle=new Bundle(); bundle.putString("name","刘亦菲");//bundle里放传输的数据 bundle.putInt("number",28); intent.putExtras(bundle);//bundle通过intent传过去 startActivity(intent); } }); }} |
BActivity接收数据
B的布局界面放一个TextView用来显式传输来的文件
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:padding="10dp" android:layout_height="match_parent"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="25dp" android:textColor="#F08080" android:id="@+id/text_1"/></LinearLayout> |
BActivity.java
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package com.example.textview.jump;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.TextView;import androidx.annotation.Nullable;import androidx.appcompat.app.AppCompatActivity;import com.example.textview.R;public class BActivity extends AppCompatActivity { private TextView mTV; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_b); mTV=findViewById(R.id.text_1); Bundle bundle=getIntent().getExtras(); String name=bundle.getString("name"); int number=bundle.getInt("number"); mTV.setText(name+","+number); }} |
startActivityForResul
界面1跳转到界面2，界面2将得到的数据又转到界面1
AActivity.java
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package com.example.textview.jump;import android.content.ComponentName;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.Toast;import androidx.annotation.Nullable;import androidx.appcompat.app.AppCompatActivity;import com.example.textview.R;public class AActivity extends AppCompatActivity { private Button ma; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_a); ma=findViewById(R.id.btn_a); ma.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //显式方法1 Intent intent=new Intent(AActivity.this,BActivity.class); //数值传递 Bundle bundle=new Bundle(); bundle.putString("name","刘亦菲");//bundle里放传输的数据 bundle.putInt("number",28); intent.putExtras(bundle);//bundle通过intent传过去 // startActivity(intent); startActivityForResult(intent,0); } }); } @Override protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { super.onActivityResult(requestCode, resultCode, data); Toast.makeText(this, data.getExtras().getString("title"), Toast.LENGTH_SHORT).show(); }} |
BActivity.java
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package com.example.textview.jump;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;import androidx.annotation.Nullable;import androidx.appcompat.app.AppCompatActivity;import com.example.textview.R;public class BActivity extends AppCompatActivity { private TextView mTV; private Button mab; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_b); mTV=findViewById(R.id.text_1); mab=findViewById(R.id.ab_1); Bundle bundle=getIntent().getExtras(); String name=bundle.getString("name"); int number=bundle.getInt("number"); mTV.setText(name+","+number); mab.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent=new Intent(); Bundle bundle1=new Bundle(); bundle1.putString("title","宝宝回啦了"); intent.putExtras(bundle1); setResult(Activity.RESULT_OK,intent); finish(); } }); }} |