设置界面所学知识

• 给退出登录添加一个监听事件

  exitLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(SettingActivity.this, "退出登录", Toast.LENGTH_SHORT).show();

                new AlertDialog.Builder(SettingActivity.this)
                        .setTitle("退出")
                        .setMessage("确认退出登录？")
                        .setPositiveButton("确认", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                SharedUtils.clearLoginInfo(SettingActivity.this);
                                // 返回我的界面
                                Intent intent = new Intent();
                                intent.putExtra("isLogin", false);
                                setResult(RESULT_OK, intent);
                                SettingActivity.this.finish();
                            }
                        })
                        .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                dialog.dismiss();
                            }
                        })
                        .show();

            }
        });

• 修改密码效果如下

  
  修改密码.png

 <RelativeLayout
        android:id="@+id/rl_modify_pwd"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:background="#F7F8F8"
        android:gravity="center_vertical"
        android:paddingLeft="10dp"
        android:paddingRight="10dp" >
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginStart="25dp"
            android:text="修改密码"
            android:textColor="#A3A3A3"
            android:textSize="16sp" />
        <ImageView
            android:layout_width="25dp"
            android:layout_height="25dp"
            android:layout_alignParentEnd="true"
            android:layout_centerVertical="true"
            android:layout_marginEnd="25dp"
            android:src="@mipmap/ic_right_arrow" />
    </RelativeLayout>

• 密码的修改

 if (TextUtils.isEmpty(oldPwd)) {
            Toast.makeText(ModifyPwdActivity.this, "原密码不能为空", Toast.LENGTH_SHORT).show();
        } else if (TextUtils.isEmpty(newPwd) || TextUtils.isEmpty(newPwdAgain)) {
            Toast.makeText(ModifyPwdActivity.this, "新密码不能为空", Toast.LENGTH_SHORT).show();
        } else if (!newPwd.equals(newPwdAgain)) {
            Toast.makeText(ModifyPwdActivity.this, "两次输入的新密码不一致", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(ModifyPwdActivity.this, "新密码设置成功", Toast.LENGTH_SHORT).show();
            SharedUtils.saveStrValue(this, username, MD5Utils.md5(newPwd));
            SharedUtils.clearLoginInfo(this);
            Intent intent = new Intent(ModifyPwdActivity.this, LoginActivity.class);
            startActivity(intent);
            ModifyPwdActivity.this.finish();
        }

• 内部存储

  // 1. 打开文件输出流
            FileOutputStream out = this.openFileOutput(FILE_NAME, Context.MODE_PRIVATE);
            // 2. 创建BufferedWriter对象
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(out));
            // 3. 写入数据
            writer.write(JSON.toJSONString(userInfo));
            // 4. 关闭输出流s