Android意图Intent总结代码

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1:项目框架

2:后端布局代码

①:MainActivity.class

package cn.cg.intenttext;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    /*
    显示意图点击事件
     */
    public void btn_1(View view) {
          //通过显示意图打开
        Intent intent=new Intent(MainActivity.this,SecondActivity.class);
        startActivity(intent);
    }


    /*
    隐式意图点击事件
     */
    public void btn_2(View view) {
       Intent  intent=new Intent();
       intent.setAction("android.intent.action.ThireActivity");
       startActivity(intent);
    }


    
    /*
   传递数据
   */
    public void btn_TranSmitData(View view) {
        //通过显示意图打开
        Intent intent=new Intent(MainActivity.this,TranSmitData.class);
        //【1】通过putExtra方法进行传递
        intent.putExtra("studentName","小明");
        //【2】通过putExtras()进行传递
        Bundle  bundle=new Bundle();
        ArrayList<String>Data=new ArrayList<>();
        Data.add("小红");
        Data.add("小张");
        Data.add("小李");
        bundle.putStringArrayList("studentName_2",Data);
        intent.putExtras(bundle);
        startActivity(intent);
    }

    /*
      回传数据
     */
    public void btn_ReturnData(View view) {
        //【3】数据回传
        Intent intent1=new Intent(MainActivity.this,ReturnData.class);
        startActivityForResult(intent1,1);
    }
    //重写onActivityResult方法
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode,resultCode,data);
        if (requestCode==1&&resultCode==2){
            String acquiredData=data.getStringExtra("data");
            Toast.makeText(MainActivity.this,acquiredData,Toast.LENGTH_SHORT).show();
        }
    }
}

②:ReturnData.class

package cn.cg.intenttext;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
public class ReturnData extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_return_data);
    }

    //回传数据
    public void btn_ReturnData(View view) {
        Intent intent=new Intent();
        intent.putExtra("data","Hello MainActivity");
        setResult(2,intent);
        finish();
    }
}

③:SecondActivity.class

package cn.cg.intenttext;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
import java.util.ArrayList;

public class SecondActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
    }
}

④:ThireActivity.class

package cn.cg.intenttext;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
public class ThireActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_thire);
    }
}

⑤:TranSmitData.class

package cn.cg.intenttext;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;

public class TranSmitData extends AppCompatActivity {
  private TextView tranSmitData;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tran_smit_data);
        //【1】创建意图，通过getStringExtra()获取数据
        Intent intent=getIntent();
        String  name=intent.getStringExtra("studentName");
        //【2】通过BundlegetString()获取数据
        Bundle  bundle=intent.getExtras();
        ArrayList<String> name_2=bundle.getStringArrayList("studentName_2");
        for (String str :name_2){
          name+=str;
        }
        tranSmitData=findViewById(R.id.text_TransmitData);
        tranSmitData.setText(name);
    }
}

3:前端布局代码:

①:activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/btn_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="btn_1"
        android:text="显示意图"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.404" />

    <Button
        android:id="@+id/btn_2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="29dp"
        android:onClick="btn_2"
        android:text="隐式意图"
        app:layout_constraintStart_toStartOf="@+id/btn_1"
        app:layout_constraintTop_toBottomOf="@+id/btn_1" />

    <Button
        android:onClick="btn_ReturnData"
        android:id="@+id/btn_ReturnData"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="26dp"
        android:text="回传数据"
        app:layout_constraintStart_toStartOf="@+id/btn_TranSmitData"
        app:layout_constraintTop_toBottomOf="@+id/btn_TranSmitData" />

    <Button
        android:onClick="btn_TranSmitData"
        android:id="@+id/btn_TranSmitData"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="33dp"
        android:layout_marginEnd="1dp"
        android:layout_marginRight="1dp"
        android:text="传递数据"
        app:layout_constraintEnd_toEndOf="@+id/btn_2"
        app:layout_constraintTop_toBottomOf="@+id/btn_2" />

</androidx.constraintlayout.widget.ConstraintLayout>

②:activity_return_data.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ReturnData">

    <Button
        android:id="@+id/btn_ReturnData2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="149dp"
        android:layout_marginLeft="149dp"
        android:layout_marginTop="298dp"
        android:onClick="btn_ReturnData"
        android:text="数据回传"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

③:activity_second.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="center"
    tools:context=".SecondActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="209dp"
        android:layout_height="73dp"
        android:layout_marginStart="92dp"
        android:layout_marginLeft="92dp"
        android:layout_marginBottom="348dp"
        android:text="显示意图"
        android:textColor="#F00"
        android:textSize="50sp"
        android:textStyle="italic"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

④:activity_thire.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ThireActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="203dp"
        android:layout_height="70dp"
        android:layout_marginStart="104dp"
        android:layout_marginLeft="104dp"
        android:layout_marginBottom="344dp"
        android:text="隐式意图"
        android:textColor="#F00"
        android:textSize="50sp"
        android:textStyle="italic"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

⑤:activity_tran_smit_data.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".TranSmitData">

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="87dp"
        android:layout_marginLeft="87dp"
        android:layout_marginBottom="327dp"
        android:text="学生列表信息:"
        android:textSize="30sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/text_TransmitData"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="7dp"
        android:layout_marginLeft="7dp"
        android:layout_marginTop="32dp"
        android:text="null"
        android:textSize="30sp"
        android:textStyle="bold"
        app:layout_constraintStart_toStartOf="@+id/textView2"
        app:layout_constraintTop_toBottomOf="@+id/textView2" />
</androidx.constraintlayout.widget.ConstraintLayout>

4:运行效果

点击显示意图

点击隐式意图

点击传递数据

点击回传数据

点击数据回传