Android——数据存储（四种方式）
1.SharedPrefereces 轻量级.XML 存储文件名，数据保存在data/data/basepackage/shared_prefs/myopt.xml中 实例-收藏-记住密码自动登录
//一种轻量级的数据存储方式//通过KEY
存入数据——putxxxx（key，value）
取出数据——getxxxx（key default）
2.读写SD卡 SD的根目录 适用于数据流读写
3.SQLite 轻量级.dp文件多用于手机里
4.Content prowvider内容提供者
网路存储 在网络后台存储
package com.example.jreduch08; import android.content.Intent; import android.content.SharedPreferences; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.CheckBox; import android.widget.EditText; public class SharePreferencesActivity extends AppCompatActivity { private CheckBox cb1; private CheckBox cb2; private SharedPreferences sp; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); cb1= (CheckBox) findViewById(R.id.checkBox1); cb2= (CheckBox) findViewById(R.id.checkBox2); Button save2= (Button) findViewById(R.id.save2); final EditText user= (EditText) findViewById(R.id.user); final EditText pwd= (EditText) findViewById(R.id.pwd); Button save= (Button) findViewById(R.id.save); sp=getSharedPreferences("userInfo",MODE_PRIVATE); save.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { SharedPreferences.Editor editor=sp.edit(); editor.putString("userName",user.getText().toString()); editor.putInt("userPwd",Integer.parseInt(pwd.getText().toString())); editor.commit(); Intent intent=new Intent(SharePreferencesActivity.this,Sp2Activity.class); startActivity(intent); } }); save2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { SharedPreferences.Editor editor=sp.edit(); // editor.putString("userName",user.getText().toString()); // editor.putInt("userPwd",Integer.parseInt(pwd.getText().toString())); editor.putBoolean("jzmm",cb1.isChecked()); editor.putBoolean("zddl",cb2.isChecked()); editor.commit(); Intent intent=new Intent(SharePreferencesActivity.this,SettingsActivity.class); startActivity(intent); } }); } @Override protected void onStart() { super.onStart(); sp=getSharedPreferences("userInfo",MODE_PRIVATE); Boolean jzmm=sp.getBoolean("jzmm",false); Boolean zddl=sp.getBoolean("zddl",false); cb1.setChecked(jzmm); cb2.setChecked(zddl); } } <?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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" tools:context=".SharePreferencesActivity"> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="请输入用户名" android:id="@+id/user" /> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="请输入密码" android:id="@+id/pwd" android:layout_below="@+id/user" android:layout_alignParentStart="true" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/save" android:text="保存" android:layout_below="@+id/checkBox2" android:layout_alignParentStart="true" /> <CheckBox android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="自动登录" android:id="@+id/checkBox2" android:layout_alignTop="@+id/checkBox1" android:layout_centerHorizontal="true" android:checked="false" /> <CheckBox android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="记住密码" android:id="@+id/checkBox1" android:layout_below="@+id/pwd" android:layout_alignParentStart="true" android:checked="false" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="保存2" android:id="@+id/save2" android:layout_below="@+id/save" android:layout_alignParentStart="true" /> </RelativeLayout> package com.example.jreduch08; import android.content.Intent; import android.content.SharedPreferences; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Switch; public class SettingsActivity extends AppCompatActivity { private Switch switch1; private Switch switch2; private SharedPreferences sp; private Button button; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_settings); switch1= (Switch) findViewById(R.id. switch1); switch2= (Switch) findViewById(R.id. switch2); button= (Button) findViewById(R.id.button); sp=getSharedPreferences("userInfo",MODE_PRIVATE); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { SharedPreferences.Editor editor=sp.edit(); editor.putBoolean("jzmm",switch1.isChecked()); editor.putBoolean("zddl",switch2.isChecked()); editor.commit(); Intent intent=new Intent(SettingsActivity.this,SharePreferencesActivity.class); startActivity(intent); } }); } @Override protected void onStart() { super.onStart(); sp=getSharedPreferences("userInfo",MODE_PRIVATE); Boolean jzmm=sp.getBoolean("jzmm",false); Boolean zddl=sp.getBoolean("zddl",false); switch1.setChecked(jzmm); switch2.setChecked(zddl); } } <?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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" tools:context="com.example.jreduch08.SettingsActivity"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" > </LinearLayout> <Switch android:layout_width="match_parent" android:layout_height="60dp" android:text="记住密码" android:id="@+id/switch1" android:layout_alignParentTop="true" android:layout_alignParentStart="true" android:checked="false" /> <Switch android:layout_width="match_parent" android:layout_height="60dp" android:text="自动登录" android:id="@+id/switch2" android:layout_below="@+id/switch1" android:layout_alignParentStart="true" android:checked="false" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="保存" android:id="@+id/button" android:layout_below="@+id/switch2" android:layout_alignParentStart="true" /> </RelativeLayout> package com.example.jreduch08; import android.content.SharedPreferences; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; public class Sp2Activity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_sp2); Button getUser= (Button) findViewById(R.id.getUser); final TextView showUser= (TextView) findViewById(R.id.showUser); final SharedPreferences sp=getSharedPreferences("userInfo",MODE_PRIVATE); getUser.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { String name=sp.getString("userName","Admin"); String pwd=String.valueOf(sp.getInt("userPwd",88888)); showUser.setText("用户名"+name+"\n"+"密码"+pwd); } }); } } <?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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" tools:context="com.example.jreduch08.Sp2Activity"> <TextView android:layout_width="match_parent" android:layout_height="100dp" android:id="@+id/showUser" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/getUser" android:text="获取用户数据" android:layout_alignBottom="@+id/showUser" android:layout_alignParentStart="true" /> </RelativeLayout>
//图片轮播的控件 //图片自动缩放的控件 compile 'com.android.support:appcompat-v7:24.0.0' compile 'com.jude:rollviewpager:1.3.4' compile 'com.flaviofaria:kenburnsview:1.0.7' compile 'com.android.support:design:24.0.0' package com.example.jreduch08; import android.graphics.Color; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import com.flaviofaria.kenburnsview.KenBurnsView; import com.jude.rollviewpager.OnItemClickListener; import com.jude.rollviewpager.RollPagerView; import com.jude.rollviewpager.adapter.StaticPagerAdapter; import com.jude.rollviewpager.hintview.ColorPointHintView; public class ZyfActivity extends AppCompatActivity { private RollPagerView rollPagerView; private KenBurnsView kenBurnsView; //图片数组 private int[]imgs={ R.mipmap.a, R.mipmap.b, R.mipmap.c, R.mipmap.d, }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_zyf); rollPagerView= (RollPagerView) findViewById(R.id.roll_view_pager); kenBurnsView= (KenBurnsView) findViewById(R.id.image); //设置播放时间间隔 rollPagerView.setPlayDelay(3000); //设置透明度 rollPagerView.setAnimationDurtion(500); //设置适配器 rollPagerView.setAdapter(new TestNormalAdapter(imgs)); //自定义指示器图片 // rollPagerView.setHintView(new IconHintView(this,R.mipmap.e,R.mipmap.d)); //设置圆点指示器颜色 rollPagerView.setHintView(new ColorPointHintView(this, Color.YELLOW,Color.WHITE)); //文字指示器 // rollPagerView.setHintView(new TextHintView(this)); //隐藏指示器 // rollPagerView.setHintView(null); rollPagerView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(int position) { kenBurnsView.setImageResource(imgs[position]); } }); } private class TestNormalAdapter extends StaticPagerAdapter{ private int []imgs; public TestNormalAdapter(int[] imgs){ this.imgs=imgs; } @Override public View getView(ViewGroup container, int position) { ImageView view=new ImageView(container.getContext()); view.setImageResource(imgs[position]); view.setScaleType(ImageView.ScaleType.CENTER_CROP); view.setLayoutParams(new ViewGroup.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); return view; } @Override public int getCount() { return imgs.length; } } } <?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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" xmlns:app="http://schemas.android.com/apk/res-auto" tools:context="com.example.jreduch08.ZyfActivity"> <com.jude.rollviewpager.RollPagerView android:layout_width="match_parent" android:layout_height="180dp" android:id="@+id/roll_view_pager" app:rollviewpager_play_delay="5000" ></com.jude.rollviewpager.RollPagerView> <com.flaviofaria.kenburnsview.KenBurnsView android:id="@+id/image" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_below="@+id/roll_view_pager"/> </RelativeLayout>
//加载网络图片 compile 'com.github.bumptech.glide:glide:3.7.0' package com.example.jreduch08; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.ImageView; import com.bumptech.glide.Glide; import com.bumptech.glide.load.engine.DiskCacheStrategy; public class GlideActivity extends AppCompatActivity { private ImageView img; private Button bt1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_glide); img = (ImageView) findViewById(R.id.img); bt1 = (Button) findViewById(R.id.bt1); bt1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Glide.with(GlideActivity.this) .load("https://img02.sogoucdn.com/net/a/04/link?url=http%3A%2F%2Fi04" + ".pictn.sogoucdn.com%2F59700dc8568d7ff3&appid=122") .asGif() .diskCacheStrategy(DiskCacheStrategy.ALL) .error(R.mipmap.ic_launcher) .into(img); } }); } } <?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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" tools:context="com.example.jreduch08.GlideActivity"> <ImageView android:layout_width="200dp" android:layout_height="200dp" android:id="@+id/img" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/bt1" android:text="加载图片" android:layout_below="@+id/img" /> </RelativeLayout>
