Intent

最新推荐文章于 2021-03-24 10:32:54 发布

原创最新推荐文章于 2021-03-24 10:32:54 发布 · 541 阅读

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文章标签：

#Android #Intent #自动跳转 #activity之间传递参数 #启动另一个activity

Android 专栏收录该内容

13 篇文章

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Intent

1.点击按钮跳转到另一个Activity

findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent it=new Intent(MainActivity.this,TwoActivity.class);
                startActivity(it);
            }
        });<

1.1传递简单的数据
btn=(Button)findViewById(R.id.button);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent it=new Intent(MainActivity.this,TwoActivity.class);
                it.putExtra("name","anna");
                it.putExtra("age",18);
                startActivity(it);
        });
另一个activity要接收数据，首先获取发送数据的那个activity的intent
Intent it=getIntent();
        textView= (TextView) this.findViewById(R.id.tv);
        textView.setText(it.getStringExtra("name")+it.getIntExtra("age",2));
1.2传递数
Intent it=new Intent(MainActivity.this,TwoActivity.class);
Bundle b=new Bundle();
b.putString("name","anna");
b.putInt("age",18);
b.putDouble("height",1.56);
it.putExtras(b);
//另一种方法
//it.putExtra("data",b);
startActivity(it);
另一个activity要接收数据，首先获取发送数据的那个activity的intent
Intent it=getIntent();
//Bundle b=it.getBundleExtra("data">;
Bundle b=it.getExtras();textView= (TextView) this.findViewById(R.id.tv);textView.setText(String.format("name=%s,age=%d,height=%f", b.getString("name"),b.getInt("age"),b.getDouble("height")));
1.3传递值对象

第一种：使用Serializable


public class User implements Serializable{
    private String name;
    private int age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public  User(String name,int age){
        this.name=name;
        this.age=age;
    }
}

btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent it=new Intent(MainActivity.this,TwoActivity.class);
                it.putExtra("user",new User("anna",18));
                startActivity(it);
            }
        });

Intent it=getIntent();
        User u= (User) it.getSerializableExtra("user");
        textView= (TextView) this.findViewById(R.id.tv);
        textView.setText(String.format("name=%s,age=%d",u.getName(),u.getAge()));

第二种：Parcelable，这样容易连接超时

import android.os.Parcel;
import android.os.Parcelable;

public class User implements Parcelable{
    private String name;
    private int age;

    protected User(Parcel in) {
        name = in.readString();
        age = in.readInt();
    }

    public static final Creator<User> CREATOR = new Creator<User>() {
        @Override
        public User createFromParcel(Parcel in) {
            return new User(in.readString(),in.readInt());
        }

        @Override
        public User[] newArray(int size) {
            return new User[size];
        }
    };

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public  User(String name,int age){
        this.name=name;
        this.age=age;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(getName());
        dest.writeInt(getAge());
    }
}

 btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent it=new Intent(MainActivity.this,TwoActivity.class);
                it.putExtra("user",new User("anna",17));
                startActivity(it);
            }
        });

Intent it=getIntent();
        User u= (User) it.getParcelableExtra("user");
        textView= (TextView) this.findViewById(R.id.tv);
        textView.setText(String.format("name=%s,age=%d",u.getName(),u.getAge()));

2.获得Activity的返回值

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.rj141.sb.intentdemo.MainActivity">

    <TextView
        android:id="@+id/one_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="启动另一个Activity"
         />

</LinearLayout>

two_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.rj141.sb.intentdemo.TwoActivity">

    <TextView
        android:id="@+id/two_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!" />

    <EditText
        android:id="@+id/two_ed"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/two_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="确定"/>
</LinearLayout>

import android.os.Parcel;
import android.os.Parcelable;

public class User implements Parcelable{
    private String name;
    private int age;

    protected User(Parcel in) {
        name = in.readString();
        age = in.readInt();
    }

    public static final Creator<User> CREATOR = new Creator<User>() {
        @Override
        public User createFromParcel(Parcel in) {
            return new User(in.readString(),in.readInt());
        }

        @Override
        public User[] newArray(int size) {
            return new User[size];
        }
    };

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public  User(String name,int age){
        this.name=name;
        this.age=age;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(getName());
        dest.writeInt(getAge());
    }
}

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 MainActivity extends AppCompatActivity{

    private Button btn;
    private TextView tv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btn=(Button)findViewById(R.id.button);
        tv= (TextView) findViewById(R.id.one_tv);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent it=new Intent(MainActivity.this,TwoActivity.class);
                it.putExtra("user",new User("anna",17));

                startActivityForResult(it,0);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        tv.setText("返回"+data.getStringExtra("data"));
    }
}

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.EditText;
import android.widget.TextView;

public class TwoActivity extends AppCompatActivity {

    private TextView textView;
    private Button two_btn;
    private EditText editText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.two_activity);

        Intent it=getIntent();
        User u= (User) it.getParcelableExtra("user");
        textView= (TextView) this.findViewById(R.id.two_tv);
        textView.setText(String.format("name=%s,age=%d",u.getName(),u.getAge()));

        editText= (EditText) this.findViewById(R.id.two_ed);

        two_btn= (Button) this.findViewById(R.id.two_btn);
        two_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent it=new Intent(TwoActivity.this,MainActivity.class);
                it.putExtra("data",editText.getText().toString());
                setResult(1,it);
                finish();
            }
        });
    }
}

3.隐藏Intent

在AndroidManifest.xml修改

<activity
    android:name=".TwoActivity">
    <intent-filter>
          <category android:name="android.intent.category.DEFAULT"></category>
          <action android:name="mytwoactivity"></action>
    </intent-filter>
</activity>

实现跳转

Intent it=new Intent("mytwoactivity");
                startActivity(it);

在AndroidManifest.xml修改

<activity
            android:name=".TwoActivity">
            <intent-filter>
                <category android:name="android.intent.category.DEFAULT"></category>
                <action android:name="com.rj141.sb.intentdemo.TwoActivity"></action>
            </intent-filter>
        </activity>

//以后采用这个，比较容易启动另一个程序的activity
Intent it=new Intent(TwoActivity.ACTION);
startActivity(it);

4.打开一个网页

Intent it = new Intent(Intent.ACTION_VIEW,Uri.parse("http://www.baidu.com"));
startActivity(it);

5.通过浏览器打开本地的activity

在AndroidManifest.xml修改

<activity
            android:name=".TwoActivity">
            <intent-filter>
                <category android:name="android.intent.category.DEFAULT"></category>
                <category android:name="android.intent.category.BROWSABLE"></category>  -->允许浏览器
                <action android:name="android.intent.action.VIEW"></action>    --->显示 
                <data android:scheme="app"/>          --->过滤器
                <action android:name="com.rj141.sb.intentdemo.TwoActivity"></action>
            </intent-filter>
        </activity>

写一个html网页之类的

<a href="app://hello">activity</a>

6.5秒自动跳转

final Intent it = new Intent(Intent.ACTION_VIEW,Uri.parse("http://www.baidu.com"));
        Timer timer=new Timer();
        TimerTask timerTask=new TimerTask() {
            @Override
            public void run() {
                startActivity(it);
            }
        };
        timer.schedule(timerTask,1000*5);