Android 複数画面 1 Activity で画面遷移

1画面 1Activity は設計も実装も楽なんですけど、なんせ Activity 間の遷移は時間がかかります。一瞬待たされるよね？ setContentView() を使って画面遷移を実現すると、待たされることはなくなります。

では、コード。

R.layout.main -> R.layout.first -> R.layout.second -> finish




という画面遷移になっています。

view plainprint?

1. package yanzm.products.screentransition.lib;  
2.   
3. import android.app.Activity;  
4. import android.content.Context;  
5. import android.content.SharedPreferences;  
6. import android.os.Bundle;  
7. import android.view.View;  
8. import android.view.View.OnClickListener;  
9. import android.widget.Button;  
10.   
11. public class MainActivity extends Activity {  
12.   
13.   static final private String prefName = "MY_PREF";  
14.   private int mScreenId = R.layout.main;  
15.   
16.   @Override  
17.   public void onCreate(Bundle savedInstanceState) {  
18.     super.onCreate(savedInstanceState);  
19.   
20.     SharedPreferences prefs = getSharedPreferences(prefName, Context.MODE_PRIVATE);  
21.     int screenId = prefs.getInt("screenId", R.layout.main);  
22.   
23.     setScreenContent(screenId);  
24.   }  
25.   
26.   @Override  
27.   public void onDestroy() {  
28.     super.onDestroy();  
29.     SharedPreferences prefs = getSharedPreferences(prefName, Context.MODE_PRIVATE);  
30.     SharedPreferences.Editor editor = prefs.edit();  
31.     editor.putInt("screenId", mScreenId);  
32.     editor.commit();  
33.   }  
34.   
35.   private void setScreenContent(int screenId) {  
36.     mScreenId = screenId;  
37.     setContentView(screenId);  
38.     
39.     switch (screenId) {  
40.     case R.layout.first: {  
41.       setFirstScreenContent();  
42.       break;  
43.     }  
44.     case R.layout.second: {  
45.       setSecondScreenContent();  
46.       break;  
47.     }  
48.     case R.layout.main: {  
49.       setMainScreenContent();  
50.       break;  
51.     }  
52.     }  
53.   }  
54.   
55.   private void setMainScreenContent() {  
56.     Button backButton = (Button) findViewById(R.id.back);  
57.     backButton.setVisibility(View.INVISIBLE);  
58.   
59.     Button nextButton = (Button) findViewById(R.id.next);  
60.     nextButton.setOnClickListener(new OnClickListener() {  
61.       public void onClick(View v) {  
62.         setScreenContent(R.layout.first);  
63.       }  
64.     });  
65.   }  
66.   
67.   private void setFirstScreenContent() {  
68.     Button backButton = (Button) findViewById(R.id.back);  
69.     backButton.setOnClickListener(new OnClickListener() {  
70.       public void onClick(View v) {  
71.         setScreenContent(R.layout.main);  
72.       }  
73.     });  
74.   
75.     Button nextButton = (Button) findViewById(R.id.next);  
76.     nextButton.setOnClickListener(new OnClickListener() {  
77.       public void onClick(View v) {  
78.         setScreenContent(R.layout.second);  
79.       }  
80.     });  
81.   }  
82.   
83.   private void setSecondScreenContent() {  
84.     Button backButton = (Button) findViewById(R.id.back);  
85.     backButton.setOnClickListener(new OnClickListener() {  
86.       public void onClick(View v) {  
87.         setScreenContent(R.layout.first);  
88.       }  
89.     });  
90.   
91.     Button nextButton = (Button) findViewById(R.id.next);  
92.     nextButton.setOnClickListener(new OnClickListener() {  
93.       public void onClick(View v) {  
94.         finish();  
95.       }  
96.     });  
97.   }  
98. }  

package yanzm.products.screentransition.lib;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {

  static final private String prefName = "MY_PREF";
  private int mScreenId = R.layout.main;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    SharedPreferences prefs = getSharedPreferences(prefName, Context.MODE_PRIVATE);
    int screenId = prefs.getInt("screenId", R.layout.main);

    setScreenContent(screenId);
  }

  @Override
  public void onDestroy() {
    super.onDestroy();
    SharedPreferences prefs = getSharedPreferences(prefName, Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = prefs.edit();
    editor.putInt("screenId", mScreenId);
    editor.commit();
  }

  private void setScreenContent(int screenId) {
    mScreenId = screenId;
    setContentView(screenId);
  
    switch (screenId) {
    case R.layout.first: {
      setFirstScreenContent();
      break;
    }
    case R.layout.second: {
      setSecondScreenContent();
      break;
    }
    case R.layout.main: {
      setMainScreenContent();
      break;
    }
    }
  }

  private void setMainScreenContent() {
    Button backButton = (Button) findViewById(R.id.back);
    backButton.setVisibility(View.INVISIBLE);

    Button nextButton = (Button) findViewById(R.id.next);
    nextButton.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
        setScreenContent(R.layout.first);
      }
    });
  }

  private void setFirstScreenContent() {
    Button backButton = (Button) findViewById(R.id.back);
    backButton.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
        setScreenContent(R.layout.main);
      }
    });

    Button nextButton = (Button) findViewById(R.id.next);
    nextButton.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
        setScreenContent(R.layout.second);
      }
    });
  }

  private void setSecondScreenContent() {
    Button backButton = (Button) findViewById(R.id.back);
    backButton.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
        setScreenContent(R.layout.first);
      }
    });

    Button nextButton = (Button) findViewById(R.id.next);
    nextButton.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
        finish();
      }
    });
  }
}

R.layout.main

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1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:orientation="vertical"  
4.     android:layout_width="fill_parent"  
5.     android:layout_height="fill_parent"  
6.     >  
7.     <TextView    
8.         android:id="@+id/content"  
9.         android:layout_width="fill_parent"   
10.         android:layout_height="wrap_content"   
11.         android:layout_weight="1"  
12.         android:text="This is main contents"  
13.         />  
14.     <include layout="@layout/back_next" />  
15. </LinearLayout>  

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <TextView  
        android:id="@+id/content"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:layout_weight="1"
        android:text="This is main contents"
        />
    <include layout="@layout/back_next" />
</LinearLayout>

R.layout.first

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1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:orientation="vertical"  
4.     android:layout_width="fill_parent"  
5.     android:layout_height="fill_parent"  
6.     >  
7.     <LinearLayout  
8.         android:orientation="vertical"  
9.         android:layout_width="fill_parent"  
10.         android:layout_height="wrap_content"  
11.         android:layout_weight="1">  
12.         <TextView    
13.            android:id="@+id/content"  
14.            android:layout_width="wrap_content"   
15.            android:layout_height="wrap_content"   
16.            android:text="this is first contents"  
17.            />  
18.        <ImageView  
19.            android:layout_width="wrap_content"   
20.            android:layout_height="wrap_content"   
21.            android:src="@drawable/icon"  
22.            />  
23.     </LinearLayout>  
24.     <include layout="@layout/back_next" />  
25. </LinearLayout>  

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1">
        <TextView  
           android:id="@+id/content"
           android:layout_width="wrap_content" 
           android:layout_height="wrap_content" 
           android:text="this is first contents"
           />
       <ImageView
           android:layout_width="wrap_content" 
           android:layout_height="wrap_content" 
           android:src="@drawable/icon"
           />
    </LinearLayout>
    <include layout="@layout/back_next" />
</LinearLayout>

R.layout.second

view plainprint?

1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:orientation="vertical"  
4.     android:layout_width="fill_parent"  
5.     android:layout_height="fill_parent"  
6.     >  
7.     <LinearLayout  
8.         android:orientation="vertical"  
9.         android:layout_width="fill_parent"  
10.         android:layout_height="wrap_content"  
11.         android:layout_weight="1">  
12.         <TextView    
13.            android:id="@+id/content"  
14.            android:layout_width="wrap_content"   
15.            android:layout_height="wrap_content"   
16.            android:text="this is second contents"  
17.            />  
18.        <ImageView  
19.            android:layout_width="wrap_content"   
20.            android:layout_height="wrap_content"   
21.            android:src="@drawable/icon"  
22.            />  
23.        <ImageView  
24.            android:layout_width="wrap_content"   
25.            android:layout_height="wrap_content"   
26.            android:src="@drawable/icon"  
27.            />  
28.     </LinearLayout>  
29.     <include layout="@layout/back_next" />  
30. </LinearLayout>  

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1">
        <TextView  
           android:id="@+id/content"
           android:layout_width="wrap_content" 
           android:layout_height="wrap_content" 
           android:text="this is second contents"
           />
       <ImageView
           android:layout_width="wrap_content" 
           android:layout_height="wrap_content" 
           android:src="@drawable/icon"
           />
       <ImageView
           android:layout_width="wrap_content" 
           android:layout_height="wrap_content" 
           android:src="@drawable/icon"
           />
    </LinearLayout>
    <include layout="@layout/back_next" />
</LinearLayout>

R.layout.back_next

view plainprint?

1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:orientation="horizontal"  
4.     android:layout_width="fill_parent"  
5.     android:layout_height="wrap_content"  
6.     >  
7.     <Button  
8.         android:id="@+id/back"  
9.         android:layout_width="0dip"  
10.         android:layout_height="wrap_content"  
11.         android:layout_weight="1"  
12.         android:text="Back"  
13.         />  
14.     <Button  
15.         android:id="@+id/next"  
16.         android:layout_width="0dip"  
17.         android:layout_height="wrap_content"  
18.         android:layout_weight="1"  
19.         android:text="Next"  
20.         />  
21. </LinearLayout>  

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    >
    <Button
        android:id="@+id/back"
        android:layout_width="0dip"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Back"
        />
    <Button
        android:id="@+id/next"
        android:layout_width="0dip"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Next"
        />
</LinearLayout>