5.10学习总结——Activity的跳转和传值

使用sharedpreference是对信息的存储，也可以进行传值，今天通过查找资料，学习了Activity的跳转和传值方法。

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();             }         });     } }